Heterocyclic amide derivatives as p2x7 receptor antagonists

ABSTRACT

The invention relates to heterocyclic amide derivatives of formula (I), 
     
       
         
         
             
             
         
       
     
     wherein R 1 , R 2 , R 3 , R 4 , R 5 , n, m, p and X are as defined in the description, their preparation and their use as pharmaceutically active compounds.

The present invention relates to heterocyclic amide derivatives of formula (I) and their use as pharmaceuticals. The invention also concerns related aspects including processes for the preparation of the compounds, pharmaceutical compositions containing one or more compounds of formula (I), and especially their use as P2X₇ receptor antagonists.

The P2X₇ receptors (P2RX7) belong to the family of P2X ionotropic receptors that are activated by extracellular nucleotides, in particular adenosine triphosphate (ATP). P2RX7 is distinguished from other P2X family members by the high concentrations (mM range) of ATP required to activate it and its ability to form a large pore upon prolonged or repeated stimulation (North, R. A., Physiol. Rev. 2002, 82(4), 1013-67; Surprenant, A., Rassendren, F. et al., Science 1996, 272(5262), 735-8; Virginio, C., MacKenzie, A. et al., J. Physiol., 1999, 519, 335-46). P2RX7 is present on many cell types, especially ones known to be involved in inflammatory and immune processes. This is reflected within both the periphery and the CNS as Lipopolysaccharide S (LPS) priming of monocytes and microglia followed by ATP stimulation has been shown to lead to the local release and processing of IL1β and other family members including IL18 through a P2RX7 mediated mechanism. Indeed mice lacking the P2X7 receptor are unable to release IL1β following LPS priming and ATP stimulation providing further evidence of its role in this pathway (Solle, M., Labasi, J. et al., J. Biol. Chem., 2001, 276(1), 125-32). In addition L-selectin shedding from monocytes, macrophages and lymphocytes, degranulation in mast cells and apoptosis in lymphocytes are all associated with P2RX7 stimulation. P2RX7 is also expressed on epithelial and endothelial cells (Ferrari, D., Chiozzi, P. et al., Neuropharmacology 1997, 36(9), 1295-301; Wiley, J. S., Chen, J. R. et al., Ciba Found Symp. 1996, 198, 149-60 and 160-5; North, R. A., Physiol. Rev. 2002, 82(4), 1013-67). In addition to its role in the periphery it may have an important function in neurotransmission within the CNS through its activation on postsynaptic and/or presynaptic central and peripheral neurons and glia (Deuchars, S. A., Atkinson, L. et al., J. Neurosci. 2001, 21(18), 7143-52; Sperlagh, B., Kofalvi, A. et al., J. Neurochem. 2002, 81(6), 1196-211). Recent data that has emerged using in situ hybridization demonstrated that P2X7 receptor mRNA was widely distributed throughout the rat brain. Specifically, among the areas of high P2X7mRNA expression noted were the piriform cortex, hippocampus, pontine nuclei and the anterior horn of the spinal cord (Yu, Y., Ugawa, S. et al., Brain. Res. 2008, 1194, 45-55). Hence there is therapeutic rationale for the use of P2X7 ion channel blockers in the treatment of a variety of disease states. These include but are not limited to diseases associated with the central nervous system such as stroke or injury and diseases associated with neuro-degeneration and neuroinflammation such as Alzheimer's disease, Huntington's disease, epilepsy, Amyotrophic lateral sclerosis, acute spinal cord injury additionally to meningitis, sleep disorders, mood and anxiety disorders as well as chronic and neuropathic and inflammatory pain. Furthermore, peripheral inflammatory disorders and autoimmune diseases including but not limited to rheumatoid arthritis, osteoarthritis, psoriasis, allergic dermatitis, asthma, chronic obstructive pulmonary disease, airways hyper-responsiveness, septic shock, bronchitis, glomerulonephritis, irritable bowel disease, skin injury, lung emphysema, Limb girdle dystrophy type 2B, fibrosis, Syndrome of synovitis Acne Pustulosis, atherosclerosis, burn injury, spinal cord injury, Hyperostosis Osteitis, Crohn's disease, ulcerative colitis, growth and metastases of malignant cells, myoblastic leukaemia, diabetes, trauma, meningitis, osteoporosis, burn injury, ischemic heart disease, and varicose veins and trauma, are all examples where the involvement of P2X7 channels has been implicated. In addition a recent report suggests a link between P2RX7 and chronic, inflammatory and neuropathic pain (Chessell, I. P., Hatcher, J. P. et al., Pain, 2005, 114(3), 386-96). Overall, these findings indicate a role for the P2X7 receptor in the process of neuronal synaptic transmission and therefore a potential role for P2X7 antagonists as novel therapeutic tools to treat neuropathic pain.

In view of the above observations, there is significant requirement for P2X7 antagonists that can be efficiently used in treating neuropathic pain, chronic inflammatory pain, inflammation, and neurodegenerative conditions.

Indole carboxamide derivatives, which are also P2X₇ receptor antagonists, have been for instance disclosed in WO 2009/108551. Pyrazolyl-acetamide derivatives as P2X₇ receptor antagonists are described in WO 2008/138876 and in L. J. Chambers et al., Bioorg. Med. Chem. Lett., 2010, 20, 3161-3164; the article additionally discloses thiazolyl-acetamide derivatives. Other P2X₇ receptor antagonists with a heterocyclic amide structure have been disclosed in WO 2013/014587 and in WO 2013/108227.

Various embodiments of the invention are presented hereafter:

1) The present invention relates to heterocyclic amide derivatives of formula (I),

wherein

n represents 1, 2 or 3;

m represents 0, 1 or 2;

p represents 0, 1 or 2;

X represents —O— or —CH₂—;

R¹ represents hydrogen, (C₁-C₂)alkyl or hydroxy-(C₁-C₂)alkyl and R² represents hydrogen or halogen; or R¹ and R² together represent a —CH₂CH₂— or a —CH₂CH₂CH₂— group; each R³ independently represents (C₁-C₄)alkyl, (C₃-C₆)cycloalkyl, (C₁-C₄)alkoxy, hydroxy-(C₁-C₃)alkyl, hydroxy-(C₂-C₃)alkoxy, hydroxy-(C₂-C₃)alkoxy(C₁-C₂)alkyl, (C₁-C₂)alkoxy-(C₁-C₂)alkyl, (C₁-C₃)fluoroalkyl, (C₁-C₃)fluoroalkoxy, cyano, halogen or phenoxy;

R⁴ represents hydrogen, (C₁-C₄)alkyl, (C₁-C₃)fluoroalkyl, amino, halogen or phenyl; and

R⁵ represents hydrogen or methyl;

and to the salts (in particular pharmaceutically acceptable salts) of such compounds.

The compounds of formula (I) according to embodiment 1) may contain one or more stereogenic or asymmetric centers, such as one or more asymmetric carbon atoms. Substituents at a double bond may be present in the (Z)- or (E)-configuration unless indicated otherwise. The compounds of formula (I) may thus be present as mixtures of stereoisomers or preferably as pure stereoisomers. Mixtures of stereoisomers may be separated in a manner known to a person skilled in the art.

In this patent application, variably attached bonds may be used for substituents or groups. In such case it is meant that the substituent or group is attached to any carbon atom of the ring system to which the variable attached bond is drawn into, provided that said carbon atom is not already specifically substituted. For example, it is understood that any group R³ may be attached to any carbon atom of the phenyl ring of formula (I) which is not already substituted. In case p represents 1, formula (I) therefore encompasses the following four formulas:

In case p represents 2, the second R³ group may be attached to any carbon atom of the phenyl ring of any one of formulas (I-1), (I-2), (I-3) or (I-4), which carbon atom is not already substituted, wherein the two R³ groups may be the same or different. In case p represents 0, the R³ group is absent.

Definitions provided herein are intended to apply uniformly to the compounds of formulae (I), (I-1), (I-2), (I-3), (I-4), (I_(Bn)), (I_(XO)) and (I_(XC)), as defined in any one of embodiments 1) to 26), and, mutatis mutandis, throughout the description and the claims unless an otherwise expressly set out definition provides a broader or narrower definition. It is well understood that a definition or preferred definition of a term defines and may replace the respective term independently of (and in combination with) any definition or preferred definition of any or all other terms as defined herein.

The term “alkyl”, used alone or in combination, refers to a straight or branched chain alkyl group containing one to four carbon atoms. The term “(C_(x)-C_(y))alkyl” (x and y each being an integer), refers to an alkyl group as defined before containing x to y carbon atoms. For example a (C₁-C₄)alkyl group contains from one to four carbon atoms. Representative examples of alkyl groups include methyl, ethyl, n-propyl, iso-propyl, n-butyl, iso-butyl, sec.-butyl and tert.-butyl.

In case “R¹” represents “(C₁-C₂)alkyl” the term means (C₁-C₂)alkyl groups as defined above. Examples of said groups are methyl and ethyl. Preferred is methyl.

In case “R³” represents “(C₁-C₄)alkyl” the term means (C₁-C₄)alkyl groups as defined above. Examples of said groups are methyl, ethyl, n-propyl, iso-propyl, n-butyl, iso-butyl, sec.-butyl and tert.-butyl. Preferred is methyl.

In case “R⁴” represents “(C₁-C₄)alkyl” the term means (C₁-C₄)alkyl groups as defined above. Examples of said groups are methyl, ethyl, n-propyl, iso-propyl, n-butyl, iso-butyl, sec.-butyl and tert.-butyl. Preferred is methyl.

The term “alkoxy”, used alone or in combination, refers to an alkyl-O— group wherein the alkyl group is as defined above. The term “(C_(x)-C_(y))alkoxy” (x and y each being an integer) refers to an alkoxy group as defined before containing x to y carbon atoms. For example a (C₁-C₄)alkoxy group contains from one to four carbon atoms. Representative examples of alkoxy groups include methoxy, ethoxy, n-propoxy, iso-propoxy, n-butoxy, iso-butoxy, sec.-butoxy and tert.-butoxy.

In case “R³” represents “(C₁-C₄)alkoxy” the term means (C₁-C₄)alkoxy groups as defined above. Examples of said groups are methoxy, ethoxy, n-propoxy, iso-propoxy, n-butoxy, iso-butoxy, sec.-butoxy and tert.-butoxy. Preferred is methoxy.

The term “hydroxy(C_(x)-C_(y))alkyl” (x and y each being an integer), used alone or in combination, refers to an alkyl group as defined before containing x to y carbon atoms in which one hydrogen atom has been replaced with hydroxy. For example a hydroxy-(C₁-C₃)alkyl group contains from one to three carbon atoms in which one hydrogen atom has been replaced with hydroxy. Examples of said groups are hydroxy-methyl, hydroxy-ethyl and hydroxy-propyl.

In case “R¹” represents “hydroxy-(C₁-C₂)alkyl” the term means hydroxy-(C₁-C₂)alkyl groups as defined above. Representative examples of said groups are hydroxy-methyl, 1-hydroxy-ethyl and 2-hydroxy-ethyl. Preferred is hydroxy-methyl.

In case “R³” represents “hydroxy-(C₁-C₃)alkyl” the term means hydroxy-(C₁-C₃)alkyl groups as defined above. Representative examples of said groups are hydroxy-methyl, 1-hydroxy-ethyl, 2-hydroxy-ethyl, 1-hydroxy-prop-1-yl, 2-hydroxy-prop-1-yl, 3-hydroxy-prop-1-yl, 1-hydroxy-prop-2-yl and 2-hydroxy-prop-2-yl. Preferred is hydroxy-methyl.

The term “(C₁-C₂)alkoxy-(C₁-C₂)alkyl”, used alone or in combination, refers to an alkyl group as defined before containing one or two carbon atoms in which one hydrogen atom has been replaced with (C₁-C₂)alkoxy as defined before. Examples of said groups are methoxy-methyl, methoxy-ethyl, ethoxy-methyl and ethoxy-ethyl.

In case “R³” represents “(C₁-C₂)alkoxy-(C₁-C₂)alkyl” the term means “(C₁-C₂)alkoxy-(C₁-C₂)alkyl groups as defined above. Representative examples of said groups are methoxy-methyl, 1-methoxy-ethyl, 2-methoxy-ethyl, ethoxy-methyl, 1-ethoxy-ethyl and 2-ethoxy-ethyl. Preferred is methoxy-methyl.

The term “hydroxy-(C_(x)-C_(y))alkoxy” (x and y each being an integer), used alone or in combination, refers to an alkoxy group as defined before containing x to y carbon atoms in which one hydrogen atom has been replaced with hydroxy. For example a hydroxy-(C₂-C₃)alkoxy group contains from two to three carbon atoms in which one hydrogen atom has been replaced with hydroxy. Examples of said groups are 2-hydroxy-ethoxy, 2-hydroxy-prop-1-oxy, 3-hydroxy-prop-1-oxy and 1-hydroxy-prop-2-oxy.

In case “R³” represents “hydroxy-(C₂-C₃)alkoxy” the term means hydroxy-(C₂-C₃)alkoxy groups as defined above. Representative examples of said groups are 2-hydroxy-ethoxy, 2-hydroxy-prop-1-oxy, 3-hydroxy-prop-1-oxy and 1-hydroxy-prop-2-oxy. Preferred is 2-hydroxy-ethoxy.

The term “hydroxy-(C₂-C₃)alkoxy-(C₁-C₂)alkyl”, used alone or in combination, refers to an alkyl group as defined before containing one or two carbon atoms in which one hydrogen atom has been replaced with hydroxy-(C₂-C₃)alkoxy as defined before. Examples of said groups are (2-hydroxy-ethoxy)-methyl, 1-(2-hydroxy-ethoxy)-ethyl, 2-(2-hydroxy-ethoxy)-ethyl, (2-hydroxy-prop-1-oxy)-methyl, (3-hydroxy-prop-1-oxy)-methyl, (1-hydroxy-prop-2-oxy)-methyl, 1-(2-hydroxy-prop-1-oxy)-ethyl, 1-(3-hydroxy-prop-1-oxy)-ethyl, 1-(1-hydroxy-prop-2-oxy)-ethyl, 2-(2-hydroxy-prop-1-oxy)-ethyl, 2-(3-hydroxy-prop-1-oxy)-ethyl, and 2-(1-hydroxy-prop-2-oxy)-ethyl.

In case “R³” represents “hydroxy-(C₂-C₃)alkoxy-(C₁-C₂)alkyl” the term means hydroxy-(C₂-C₃)alkoxy-(C₁-C₂)alkyl groups as defined above. Representative examples of said groups are (2-hydroxy-ethoxy)-methyl, 1-(2-hydroxy-ethoxy)-ethyl, 2-(2-hydroxy-ethoxy)-ethyl, (2-hydroxy-prop-1-oxy)-methyl, (3-hydroxy-prop-1-oxy)-methyl, (1-hydroxy-prop-2-oxy)-methyl, 1-(2-hydroxy-prop-1-oxy)-ethyl, 1-(3-hydroxy-prop-1-oxy)-ethyl, 1-(1-hydroxy-prop-2-oxy)-ethyl, 2-(2-hydroxy-prop-1-oxy)-ethyl, 2-(3-hydroxy-prop-1-oxy)-ethyl, and 2-(1-hydroxy-prop-2-oxy)-ethyl. Preferred is (2-hydroxy-ethoxy)-methyl.

The term “(C₃-C₆)cycloalkyl”, used alone or in combination, refers to a cycloalkyl group with 3 to 6 carbon atoms. Examples of (C₃-C₆)cycloalkyl groups are cyclopropyl, cyclobutyl, cyclopentyl and cyclohexyl.

In case “R³” represents “(C₃-C₆)cycloalkyl” the term means (C₃-C₆)cycloalkyl groups as defined above. Representative examples of said groups are cyclopropyl, cyclobutyl, cyclopentyl and cyclohexyl. Preferred is cyclopropyl.

The term “(C_(x)-C_(y))fluoroalkyl” (x and y each being an integer) refers to an alkyl group as defined before containing x to y carbon atoms in which one or more (and possibly all) hydrogen atoms have been replaced with fluoro. For example a (C₁-C₃)fluoroalkyl group contains from one to three carbon atoms in which one to seven hydrogen atoms have been replaced with fluoro.

In case “R³” represents “(C₁-C₃)fluoroalkyl” the term means (C₁-C₃)fluoroalkyl groups as defined above. Representative examples of said groups are difluoromethyl, trifluoromethyl, 2,2-difluoroethyl and 2,2,2-trifluoroethyl. Preferred is trifluoromethyl.

In case “R⁴” represents “(C₁-C₃)fluoroalkyl” the term means (C₁-C₃)fluoroalkyl groups as defined above. Representative examples of said groups are difluoromethyl, trifluoromethyl, 2,2-difluoroethyl and 2,2,2-trifluoroethyl. Preferred is trifluoromethyl.

The term “(C_(x)-C_(y))fluoroalkoxy” (x and y each being an integer) refers to an alkoxy group as defined before containing x to y carbon atoms in which one or more (and possibly all) hydrogen atoms have been replaced with fluoro. For example a (C₁-C₃)fluoroalkoxy group contains from one to three carbon atoms in which one to seven hydrogen atoms have been replaced with fluoro.

In case “R³” represents “(C₁-C₃)fluoroalkoxy” the term means (C₁-C₃)fluoroalkoxy groups as defined above. Representative examples of said groups are difluoromethoxy, trifluoromethoxy, 2,2-difluoroethoxy and 2,2,2-trifluoroethoxy. Preferred is trifluoromethoxy.

The term halogen means fluoro, chloro or bromo.

In case “R²” represents “halogen” the term means fluoro, chloro or bromo. Preferred is chloro.

In case “R³” represents “halogen” the term means fluoro, chloro or bromo. Preferred are chloro and bromo.

In case “R⁴” represents “halogen” the term means fluoro, chloro or bromo. Preferred is bromo.

2) A further embodiment of the invention relates to compounds of formula (I) according to embodiment 1) that are also compounds of formula (I_(Bn)),

wherein

n represents 1, 2 or 3;

p represents 1 or 2;

X represents —O— or —CH₂—;

R¹ represents hydrogen, (C₁-C₂)alkyl or hydroxy-(C₁-C₂)alkyl and R² represents hydrogen or halogen; or R¹ and R² together represent a —CH₂CH₂— group;

each R³ independently represents (C₁-C₄)alkyl, (C₃-C₆)cycloalkyl, (C₁-C₄)alkoxy, hydroxy-(C₁-C₃)alkyl, hydroxy-(C₂-C₃)alkoxy, hydroxy-(C₂-C₃)alkoxy-(C₁-C₂)alkyl, (C₁-C₂)alkoxy-(C₁-C₂)alkyl, (C₁-C₃)fluoroalkyl, cyano or halogen; and

R⁴ represents hydrogen, (C₁-C₄)alkyl, (C₁-C₃)fluoroalkyl, amino or halogen; and to the salts (in particular pharmaceutically acceptable salts) of such compounds.

3) A further embodiment of the invention relates to compounds according to embodiment 2), wherein

n represents 1, 2 or 3;

p represents 1 or 2;

X represents —O— or —CH₂—;

R¹ represents hydrogen or methyl and R² represents chloro; or R¹ and R² together represent a —CH₂CH₂— group;

each R³ independently represents (C₁-C₄)alkyl, (C₃-C₆)cycloalkyl, (C₁-C₄)alkoxy, hydroxy-(C₁-C₃)alkyl, hydroxy-(C₂-C₃)alkoxy, hydroxy-(C₂-C₃)alkoxy-(C₁-C₂)alkyl, (C₁-C₂)alkoxy-(C₁-C₂)alkyl, trifluoromethyl or halogen; and

R⁴ represents hydrogen, (C₁-C₄)alkyl, trifluoromethyl, amino or halogen;

and to the salts (in particular pharmaceutically acceptable salts) of such compounds.

4) A further embodiment of the invention relates to compounds according to embodiment 2), wherein

n represents 1, 2 or 3;

p represents 1 or 2;

X represents —O— or —CH₂—;

R¹ represents hydrogen or methyl and R² represents chloro; or R¹ and R² together represent a —CH₂CH₂— group;

each R³ independently represents methyl, cyclopropyl, methoxy, hydroxy-methyl, 2-hydroxy-ethoxy, (2-hydroxy-ethoxy)-methyl, methoxy-methyl, trifluoromethyl, fluoro, chloro or bromo; and

R⁴ represents hydrogen, methyl, trifluoromethyl, amino or bromo;

and to the salts (in particular pharmaceutically acceptable salts) of such compounds.

5) A further embodiment of the invention relates to compounds of formula (I) according to embodiment 1) that are also compounds of formula (I_(XO)),

wherein

n represents 1, 2 or 3;

m represents 0, 1 or 2;

p represents 1 or 2;

R¹ represents hydrogen, (C₁-C₂)alkyl or hydroxy-(C₁-C₂)alkyl and R² represents hydrogen or halogen; or R¹ and R² together represent a —CH₂CH₂— or a —CH₂CH₂CH₂— group;

each R³ independently represents (C₁-C₄)alkyl, (C₃-C₆)cycloalkyl, (C₁-C₄)alkoxy, hydroxy-(C₁-C₃)alkyl, hydroxy-(C₂-C₃)alkoxy, hydroxy-(C₂-C₃)alkoxy-(C₁-C₂)alkyl, (C₁-C₂)alkoxy-(C₁-C₂)alkyl, (C₁-C₃)fluoroalkyl, (C₁-C₃)fluoroalkoxy, cyano, halogen or phenoxy; and

R⁵ represents hydrogen or methyl;

and to the salts (in particular pharmaceutically acceptable salts) of such compounds.

6) A further embodiment of the invention relates to compounds according to embodiment 5), wherein

n represents 1 or 2;

m represents 0;

p represents 1 or 2;

R¹ represents hydrogen and R² represents hydrogen or halogen; or R¹ and R² together represent a —CH₂CH₂— group;

each R³ independently represents (C₁-C₄)alkyl, (C₃-C₆)cycloalkyl, hydroxy-(C₁-C₃)alkyl, hydroxy-(C₂-C₃)alkoxy, hydroxy-(C₂-C₃)alkoxy-(C₁-C₂)alkyl, trifluoromethyl, cyano or halogen; and

R⁵ represents hydrogen;

and to the salts (in particular pharmaceutically acceptable salts) of such compounds.

7) A further embodiment of the invention relates to compounds according to embodiment 5), wherein

n represents 1 or 2;

m represents 0;

p represents 1 or 2;

R¹ represents hydrogen and R² represents chloro; or R¹ and R² together represent a —CH₂CH₂— group;

each R³ independently represents methyl, cyclopropyl, hydroxy-methyl, 2-hydroxy-ethoxy, (2-hydroxy-ethoxy)-methyl, trifluoromethyl, fluoro, chloro or bromo; and

R⁵ represents hydrogen;

and to the salts (in particular pharmaceutically acceptable salts) of such compounds.

8) A further embodiment of the invention relates to compounds of formula (I) according to embodiment 1) that are also compounds of formula (I_(XC)),

wherein

n represents 1, 2 or 3;

m represents 0, 1 or 2;

p represents 1 or 2;

R¹ represents hydrogen, (C₁-C₂)alkyl or hydroxy-(C₁-C₂)alkyl and R² represents hydrogen or halogen; or R¹ and R² together represent a —CH₂CH₂— or a —CH₂CH₂CH₂— group;

each R³ independently represents (C₁-C₄)alkyl, (C₃-C₆)cycloalkyl, (C₁-C₄)alkoxy, hydroxy-(C₁-C₃)alkyl, (C₁-C₂)alkoxy-(C₁-C₂)alkyl, (C₁-C₃)fluoroalkyl, (C₁-C₃)fluoroalkoxy, cyano, halogen or phenoxy;

R⁴ represents hydrogen, (C₁-C₄)alkyl, (C₁-C₃)fluoroalkyl, amino, halogen or phenyl; and

R⁵ represents hydrogen or methyl;

and to the salts (in particular pharmaceutically acceptable salts) of such compounds.

9) A further embodiment of the invention relates to compounds according to embodiment 8), wherein

n represents 1, 2 or 3;

m represents 0;

p represents 1 or 2;

R¹ represents hydrogen, (C₁-C₂)alkyl or hydroxy-(C₁-C₂)alkyl and R² represents hydrogen or halogen; or R¹ and R² together represent a —CH₂CH₂— group;

each R³ independently represents (C₁-C₄)alkyl, (C₁-C₄)alkoxy, hydroxy-(C₁-C₃)alkyl, (C₁-C₂)alkoxy-(C₁-C₂)alkyl, trifluoromethyl or halogen;

R⁴ represents hydrogen, (C₁-C₄)alkyl, trifluoromethyl, amino or halogen; and

R⁵ represents hydrogen;

and to the salts (in particular pharmaceutically acceptable salts) of such compounds.

10) A further embodiment of the invention relates to compounds according to embodiment 8), wherein

n represents 1, 2 or 3;

m represents 0;

p represents 1 or 2;

R¹ represents hydrogen or methyl and R² represents chloro; or R¹ and R² together represent a —CH₂CH₂— group;

each R³ independently represents methyl, methoxy, hydroxy-methyl, methoxy-methyl, trifluoromethyl, fluoro, chloro or bromo;

R⁴ represents hydrogen, methyl, trifluoromethyl, amino or bromo; and

R⁵ represents hydrogen;

and to the salts (in particular pharmaceutically acceptable salts) of such compounds.

11) A further embodiment of the invention relates to compounds according to any one of embodiments 1) to 10), wherein

n represents 1;

and to the salts (in particular pharmaceutically acceptable salts) of such compounds.

12) A further embodiment of the invention relates to compounds according to any one of embodiments 1) to 10), wherein

n represents 2;

and to the salts (in particular pharmaceutically acceptable salts) of such compounds.

13) A further embodiment of the invention relates to compounds according to any one of embodiments 1) to 5) or 8) to 10), wherein

n represents 3;

and to the salts (in particular pharmaceutically acceptable salts) of such compounds.

14) A further embodiment of the invention relates to compounds according to any one of embodiments 1), 5), 8) or 11) to 13), wherein

m represents 0;

and to the salts (in particular pharmaceutically acceptable salts) of such compounds.

15) A further embodiment of the invention relates to compounds according to any one of embodiments 1) to 14), wherein

p represents 2;

and to the salts (in particular pharmaceutically acceptable salts) of such compounds.

16) A further embodiment of the invention relates to compounds according to any one of embodiments 1), 2), 5), 8), 9) or 11) to 15), wherein

R¹ represents hydrogen, methyl or hydroxy-methyl and R² represents chloro; and to the salts (in particular pharmaceutically acceptable salts) of such compounds.

17) A further embodiment of the invention relates to compounds according to any one of embodiments 1) to 15), wherein

R¹ represents hydrogen and R² represents chloro;

and to the salts (in particular pharmaceutically acceptable salts) of such compounds.

18) A further embodiment of the invention relates to compounds according to any one of embodiments 1) to 15), wherein

R¹ and R² together represent a —CH₂CH₂— group;

and to the salts (in particular pharmaceutically acceptable salts) of such compounds.

19) A further embodiment of the invention relates to compounds according to any one of embodiments 1) to 5) or 11) to 18), wherein

a first R³ group is attached in para-position relative to the R¹-bearing carbon atom and represents chloro; and

a second R³ group is absent, or is attached in ortho-position relative to the R¹-bearing carbon atom and represents methyl, cyclopropyl, methoxy, hydroxy-methyl, 2-hydroxy-ethoxy, (2-hydroxy-ethoxy)-methyl, methoxy-methyl, chloro or bromo;

and to the salts (in particular pharmaceutically acceptable salts) of such compounds.

20) A further embodiment of the invention relates to compounds according to any one of embodiments 1) to 18), wherein

a first R³ group is attached in para-position relative to the R¹-bearing carbon atom and represents chloro; and

a second R³ group is attached in ortho-position relative to the R¹-bearing carbon atom and represents methyl, hydroxy-methyl, chloro or bromo;

and to the salts (in particular pharmaceutically acceptable salts) of such compounds.

21) A further embodiment of the invention relates to compounds according to any one of embodiments 1) to 4) or 8) to 20), wherein

R⁴ represents hydrogen;

and to the salts (in particular pharmaceutically acceptable salts) of such compounds.

22) A further embodiment of the invention relates to compounds according to any one of embodiments 1) to 4) or 8) to 20), wherein

R⁴ represents methyl or amino;

and to the salts (in particular pharmaceutically acceptable salts) of such compounds.

23) A further embodiment of the invention relates to compounds according to any one of embodiments 1), 5), 8) or 11) to 22), wherein

R⁵ represents hydrogen;

and to the salts (in particular pharmaceutically acceptable salts) of such compounds.

24) A further embodiment of the invention relates to compounds according to any one of embodiments 1) to 23), wherein the stereogenic center in the heterocyclic ring system is (S)-configurated;

and to the salts (in particular pharmaceutically acceptable salts) of such compounds.

25) A further embodiment of the invention relates to compounds according to any one of embodiments 1) to 23), wherein the stereogenic center in the heterocyclic ring system is (R)-configurated;

and to the salts (in particular pharmaceutically acceptable salts) of such compounds.

26) Preferred compounds of formula (I) as defined in embodiment 1) are selected from the group consisting of:

-   N-(4-chlorobenzyl)-5,6-dihydrofuro[2,3-d]thiazole-6-carboxamide; -   N-(2,4-dichlorobenzyl)-5,6-dihydrofuro[2,3-d]thiazole-6-carboxamide; -   N-(2-chloro-4-fluorobenzyl)-5,6-dihydrofuro[2,3-d]thiazole-6-carboxamide; -   N-(3,4-dichlorobenzyl)-5,6-dihydrofuro[2,3-d]thiazole-6-carboxamide; -   N-(2-bromo-4,6-dichlorobenzyl)-5,6-dihydrofuro[2,3-d]thiazole-6-carboxamide; -   N-(2,4-dichloro-6-methylbenzyl)-5,6-dihydrofuro[2,3-d]thiazole-6-carboxamide; -   N-(2,4-dichlorophenethyl)-5,6-dihydrofuro[2,3-d]thiazole-6-carboxamide; -   N-(3-(2,4-dichlorophenyl)propyl)-5,6-dihydrofuro[2,3-d]thiazole-6-carboxamide; -   N-(1-(2,4-dichlorophenyl)-2-hydroxyethyl)-5,6-dihydrofuro[2,3-d]thiazole-6-carboxamide; -   N-(2,4-dichloro-6-(hydroxymethyl)benzyl)-5,6-dihydrofuro[2,3-d]thiazole-6-carboxamide; -   N-(5,7-dichloro-2,3-dihydro-1H-inden-1-yl)-5,6-dihydrofuro[2,3-d]thiazole-6-carboxamide; -   N-(2,4-dichloro-6-cyclopropylbenzyl)-5,6-dihydrofuro[2,3-d]thiazole-6-carboxamide; -   N-(2-chloro-3-(trifluoromethyl)benzyl)-5,6-dihydrofuro[2,3-d]thiazole-6-carboxamide; -   N-(3-chloro-2-(trifluoromethyl)benzyl)-5,6-dihydrofuro[2,3-d]thiazole-6-carboxamide; -   N-(2,4-dichloro-6-((2-hydroxyethoxy)methyl)benzyl)-5,6-dihydrofuro[2,3-d]thiazole-6-carboxamide; -   N-(4-phenoxybenzyl)-5,6-dihydrofuro[2,3-d]thiazole-6-carboxamide; -   N-(2,4-dichlorobenzyl)-5,6-dihydro-4H-cyclopenta[d]thiazole-6-carboxamide; -   N-(2-chloro-4-fluorobenzyl)-5,6-dihydro-4H-cyclopenta[d]thiazole-6-carboxamide; -   N-(2-bromo-4,6-dichlorobenzyl)-5,6-dihydro-4H-cyclopenta[d]thiazole-6-carboxamide; -   N-(2,4-dichloro-6-methylbenzyl)-5,6-dihydro-4H-cyclopenta[d]thiazole-6-carboxamide; -   N-(2,4-dichlorophenethyl)-5,6-dihydro-4H-cyclopenta[d]thiazole-6-carboxamide; -   N-(2-chloro-3-cyanobenzyl)-5,6-dihydro-4H-cyclopenta[d]thiazole-6-carboxamide; -   N-(3-(2,4-dichlorophenyl)propyl)-5,6-dihydro-4H-cyclopenta[d]thiazole-6-carboxamide; -   N-(1-(2,4-dichlorophenyl)-2-hydroxyethyl)-5,6-dihydro-4H-cyclopenta[d]thiazole-6-carboxamide; -   N-(2,4-dichloro-6-(hydroxymethyl)benzyl)-5,6-dihydro-4H-cyclopenta[d]thiazole-6-carboxamide; -   N-(2,4-dichloro-6-methoxybenzyl)-5,6-dihydro-4H-cyclopenta[d]thiazole-6-carboxamide; -   N-(5,7-dichloro-2,3-dihydro-1H-inden-1-yl)-5,6-dihydro-4H-cyclopenta[d]thiazole-6-carboxamide; -   N-(2-chloro-3-(trifluoromethyl)benzyl)-5,6-dihydro-4H-cyclopenta[d]thiazole-6-carboxamide; -   N-(3-fluoro-4-(trifluoromethoxy)benzyl)-5,6-dihydro-4H-cyclopenta[d]thiazole-6-carboxamide; -   N-(4-chlorobenzyl)-N-methyl-6,7-dihydro-5H-pyrano[2,3-d]thiazole-7-carboxamide; -   N-(2,4-dichlorobenzyl)-6,7-dihydro-5H-pyrano[2,3-d]thiazole-7-carboxamide; -   N-(2-chloro-4-fluorobenzyl)-6,7-dihydro-5H-pyrano[2,3-d]thiazole-7-carboxamide; -   N-(2,3-dichlorobenzyl)-6,7-dihydro-5H-pyrano[2,3-d]thiazole-7-carboxamide; -   N-(2,4-dichloro-6-methylbenzyl)-6,7-dihydro-5H-pyrano[2,3-d]thiazole-7-carboxamide; -   N-(2,4-dichlorophenethyl)-6,7-dihydro-5H-pyrano[2,3-d]thiazole-7-carboxamide; -   N-(2-chloro-3-cyanobenzyl)-6,7-dihydro-5H-pyrano[2,3-d]thiazole-7-carboxamide; -   N-(4-(trifluoromethyl)benzyl)-6,7-dihydro-5H-pyrano[2,3-d]thiazole-7-carboxamide; -   N-(3-(2,4-dichlorophenyl)propyl)-6,7-dihydro-5H-pyrano[2,3-d]thiazole-7-carboxamide; -   N—((S)-1-(2,4-dichlorophenyl)-2-hydroxyethyl)-6,7-dihydro-5H-pyrano[2,3-d]thiazole-7-carboxamide; -   N-(2,4-dichloro-6-(hydroxymethyl)benzyl)-6,7-dihydro-5H-pyrano[2,3-d]thiazole-7-carboxamide; -   N—((S)-5,7-dichloro-2,3-dihydro-1H-inden-1-yl)-6,7-dihydro-5H-pyrano[2,3-d]thiazole-7-carboxamide; -   N-(2-chloro-3-(trifluoromethyl)benzyl)-6,7-dihydro-5H-pyrano[2,3-d]thiazole-7-carboxamide; -   N-(2,4-dichloro-6-(2-hydroxyethoxy)benzyl)-6,7-dihydro-5H-pyrano[2,3-d]thiazole-7-carboxamide; -   N-(3-fluoro-4-(trifluoromethoxy)benzyl)-6,7-dihydro-5H-pyrano[2,3-d]thiazole-7-carboxamide; -   N-(4-phenoxybenzyl)-6,7-dihydro-5H-pyrano[2,3-d]thiazole-7-carboxamide; -   N-(4-chlorobenzyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; -   N-(4-chlorobenzyl)-N-methyl-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; -   N-(3-chloro-2-methyl     benzyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; -   2-amino-N-(2,4-dichlorobenzyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; -   N-(2,4-dichlorobenzyl)-2-methyl-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; -   2-bromo-N-(2,4-dichlorobenzyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; -   N-(2,4-dichlorobenzyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; -   N-(2-chloro-4-fluorobenzyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; -   N-(2,3-dichlorobenzyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; -   N-(2,3-dihydro-1H-inden-1-yl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; -   N—((R)-1-(2,4-dichlorophenyl)ethyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; -   N-(2,4-dichloro-6-methylbenzyl)-2-phenyl-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; -   N-(2,4-dichloro-6-methylbenzyl)-2-(trifluoromethyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; -   2-amino-N-(2,4-dichloro-6-methylbenzyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; -   N-(2,4-dichloro-6-methylbenzyl)-2-methyl-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; -   2-bromo-N-(2,4-dichloro-6-methylbenzyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; -   N-(2,4-dichloro-6-methylbenzyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; -   N-(2,4-dichlorophenethyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; -   N—((S)-1-(2,4-dichlorophenyl)-2-hydroxyethyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; -   N-(2,4-dichloro-6-(hydroxymethyl)benzyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; -   2-bromo-N-(2-chloro-3-(trifluoromethyl)benzyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; -   N-(2-chloro-3-(trifluoromethyl)benzyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; -   N-(2,4-dichloro-6-(methoxymethyl)benzyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; -   N-(3-fluoro-4-(trifluoromethoxy)benzyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; -   N-(4-phenoxybenzyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; -   2-amino-N-(2,4-dichlorobenzyl)-5,6,7,8-tetrahydro-4H-cyclohepta[d]thiazole-8-carboxamide; -   N-(2,4-dichlorobenzyl)-5,6,7,8-tetrahydro-4H-cyclohepta[d]thiazole-8-carboxamide; -   2-amino-N-(2,4-dichloro-6-methylbenzyl)-5,6,7,8-tetrahydro-4H-cyclohepta[d]thiazole-8-carboxamide; -   N-(2,4-dichloro-6-methylbenzyl)-5,6,7,8-tetrahydro-4H-cyclohepta[d]thiazole-8-carboxamide; -   (R)—N—((S)-1-(2,4-dichlorophenyl)-2-hydroxyethyl)-5,6,7,8-tetrahydro-4H-cyclohepta[d]thiazole-8-carboxamide;     and -   (S)—N—((S)-1-(2,4-dichlorophenyl)-2-hydroxyethyl)-5,6,7,8-tetrahydro-4H-cyclohepta[d]thiazole-8-carboxamide;

or salts (in particular pharmaceutically acceptable salts) of such compounds;

it is to be understood for any of the above listed compounds, that a stereogenic center, which is not specifically assigned, may be in absolute (R)- or absolute (S)-configuration; for example a compound listed as N-(2-bromo-4,6-dichlorobenzyl)-5,6-dihydrofuro[2,3-d]thiazole-6-carboxamide may be (R)—N-(2-bromo-4,6-dichlorobenzyl)-5,6-dihydrofuro[2,3-d]thiazole-6-carboxamide, (S)—N-(2-bromo-4,6-dichlorobenzyl)-5,6-dihydrofuro[2,3-d]thiazole-6-carboxamide or any mixture thereof.

It is well understood that the invention relates to compounds according to embodiment 1); or according to embodiment 1) limited by the features of an embodiment dependent on embodiment 1; or according to embodiment 1) limited by the features of a cascade of dependent embodiments e.g. in the form of “embodiment 3) depending on embodiment 2) depending on embodiment 1)”. In case of an embodiment depending on more than one other embodiment, it is understood that each combination is specifically disclosed. Also, in case an embodiment is dependent on more than one other embodiment and one or more of said other embodiments are themselves dependent on one or more further embodiments, it is understood that each combination is specifically disclosed if obtainable with regard to the given dependencies and multiple dependencies. Notably, embodiments resulting from cascades of more than three embodiments depending on each other may be construed under observance of the given dependencies and multiple dependencies and are thus intended to be specifically disclosed. Representative examples of embodiments which are possible based on the dependencies of the embodiments 1) to 26) as disclosed hereinabove and which are therefore intended and herewith specifically disclosed in individualized form are:

1, 2+1, 3+2+1, 4+2+1, 5+1, 6+5+1, 7+5+1, 8+1, 9+8+1, 10+8+1, 11+3+2+1, 11+6+5+1, 11+9+8+1, 12+3+2+1, 12+6+5+1, 12+9+8+1, 13+3+2+1, 13+9+8+1, 14+1, 15+1, 15+2+1, 15+3+2+1, 15+4+2+1, 15+5+1, 15+6+5+1, 15+7+5+1, 15+8+1, 15+9+8+1, 15+10+8+1, 16+1, 16+2+1, 16+5+1, 16+9+8+1, 17+1, 17+3+2+1, 17+6+5+1, 17+9+8+1, 17+15+1, 17+15+2+1, 17+15+3+2+1, 17+15+4+2+1, 17+15+5+1, 17+15+6+5+1, 17+15+7+5+1, 17+15+8+1, 17+15+9+8+1, 17+15+10+8+1, 18+1, 18+3+2+1, 18+6+5+1, 18+9+8+1, 18+15+1, 18+15+2+1, 18+15+3+2+1, 18+15+4+2+1, 18+15+5+1, 18+15+6+5+1, 18+15+7+5+1, 18+15+8+1, 18+15+9+8+1, 18+15+10+8+1, 19+1, 19+3+2+1, 19+5+1, 19+14+1, 19+15+1, 19+15+2+1, 19+15+3+2+1, 19+15+4+2+1, 19+15+5+1, 19+15+6+5+1, 19+15+7+5+1, 19+15+8+1, 19+15+9+8+1, 19+15+10+8+1, 19+16+1, 19+16+2+1, 19+16+5+1, 19+16+9+8+1, 20+1, 20+2+1, 20+3+2+1, 20+4+2+1, 20+5+1, 20+6+5+1, 20+7+5+1, 20+8+1, 20+9+8+1, 20+10+8+1, 21+1, 21+2+1, 21+3+2+1, 21+4+2+1, 21+8+1, 21+9+8+1, 21+10+8+1, 21+20+1, 21+20+2+1, 21+20+3+2+1, 21+20+4+2+1, 21+20+5+1, 21+20+6+5+1, 21+20+7+5+1, 21+20+8+1, 21+20+9+8+1, 21+20+10+8+1, 22+1, 22+2+1, 22+3+2+1, 22+4+2+1, 22+8+1, 22+9+8+1, 22+10+8+1, 22+20+1, 22+20+2+1, 22+20+3+2+1, 22+20+4+2+1, 22+20+5+1, 22+20+6+5+1, 22+20+7+5+1, 22+20+8+1, 22+20+9+8+1, 22+20+10+8+1, 23+1, 23+5+1, 23+8+1, 24+1, 24+2+1, 24+3+2+1, 24+4+2+1, 24+5+1, 24+6+5+1, 24+7+5+1, 24+8+1, 24+9+8+1, 24+10+8+1, 24+17+1, 24+17+3+2+1, 24+17+6+5+1, 24+17+9+8+1, 24+17+15+1, 24+17+15+2+1, 24+17+15+3+2+1, 24+17+15+4+2+1, 24+17+15+5+1, 24+17+15+6+5+1, 24+17+15+7+5+1, 24+17+15+8+1, 24+17+15+9+8+1, 24+17+15+10+8+1, 25+1, 25+2+1, 25+3+2+1, 25+4+2+1, 25+5+1, 25+6+5+1, 25+7+5+1, 25+8+1, 25+9+8+1, 25+10+8+1, 25+17+1, 25+17+3+2+1, 25+17+6+5+1, 25+17+9+8+1, 25+17+15+1, 25+17+15+2+1, 25+17+15+3+2+1, 25+17+15+4+2+1, 25+17+15+5+1, 25+17+15+6+5+1, 25+17+15+7+5+1, 25+17+15+8+1, 25+17+15+9+8+1, 25+17+15+10+8+1, and 26+1;

wherein the list above is not to be construed as limiting with respect to further embodiments which are also possible based on the dependencies of the embodiments 1) to 26) as disclosed hereinabove and which are also intended. In the list above the numbers refer to the embodiments according to their numbering provided hereinabove whereas “+” indicates the dependency from another embodiment. The different individualized embodiments are separated by commas. In other words, “3+2+1” for example refers to embodiment 3) depending on embodiment 2) depending on embodiment 1), i.e. embodiment “3+2+1” corresponds to embodiment 1) further limited by the features of embodiments 2) and 3).

The present invention also includes isotopically labelled, especially ²H (deuterium) labelled compounds of formula (I), which compounds are identical to the compounds of formula (I) except that one or more atoms have each been replaced by an atom having the same atomic number but an atomic mass different from the atomic mass usually found in nature. Isotopically labelled, especially ²H (deuterium) labelled compounds of formula (I) and salts thereof are within the scope of the present invention. Substitution of hydrogen with the heavier isotope ²H (deuterium) may lead to greater metabolic stability, resulting e.g. in increased in-vivo half-life or reduced dosage requirements, or may lead to reduced inhibition of cytochrome P450 enzymes, resulting e.g. in an improved safety profile. In one embodiment of the invention, the compounds of formula (I) are not isotopically labelled, or they are labelled only with one or more deuterium atoms. In a sub-embodiment, the compounds of formula (I) are not isotopically labelled at all. Isotopically labelled compounds of formula (I) may be prepared in analogy to the methods described hereinafter, but using the appropriate isotopic variation of suitable reagents or starting materials.

The term “pharmaceutically acceptable salts” refers to non-toxic, inorganic or organic acid and/or base addition salts, Lit. e.g. “Salt selection for basic drugs”, Int. J. Pharm. (1986), 33, 201-217.

Where the plural form is used for compounds, salts, pharmaceutical compositions, diseases and the like, this is intended to mean also a single compound, salt, or the like.

The compounds of formula (I) according to any one of embodiments 1) to 26), or pharmaceutically acceptable salts thereof, are suitable for use as medicaments. In particular, compounds of formula (I) modulate the P2X₇ receptor, i.e. they act as P2X₇ receptor antagonists, and are useful for the prevention or treatment of diseases which are associated with the activation of the P2X₇ receptor such as pain; neurodegenerative and neuroinflammatory diseases; bone and joint diseases; obstructive diseases of the airways; cardiovascular diseases; eye diseases; skin diseases; abdominal and gastrointestinal tract diseases; genitourinary diseases; cancer; other auto-immune and allergic disorders; and other disorders with an inflammatory or immunological component.

In particular, the compounds of formula (I) according to any one of embodiments 1) to 26), or pharmaceutically acceptable salts thereof, are suitable for the prevention or treatment of pain. Pain refers to acute pain; chronic pain; pain associated with sprains and strains; chronic articular pain; pain associated with rheumatic fever; musculoskeletal pain; lower back and neck pain; inflammatory pain; neuropathic pain; visceral pain; pain associated with influenza or other viral infections; pain associated with cancer and tumor invasion; joint and bone pain; atypical facial pain; pain associated with migraine, toothache and dysmenorrhea; headache including tension headache and cluster headaches; pain associated with myocardial ischemia; pain associated with functional bowel disorders; sympathetically maintained pain; myositis; pain associated with cancer chemotherapy; and post operative pain.

Neuropathic pain includes especially diabetic neuropathy, sciatica, non-specific lower back pain, trigeminal neuralgia, multiple sclerosis pain, fibromyalgia, HIV-related neuropathy, post-herpetic neuralgia, and pain resulting from physical trauma, amputation, phantom limb syndrome, spinal surgery, cancer, toxins or chronic inflammatory conditions. In addition, neuropathic pain conditions include pain associated with normally non-painful sensations such as “pins and needles” (paraesthesias and dysesthesias), increased sensitivity to touch (hyperesthesia), painful sensation following innocuous stimulation (dynamic, static, thermal or cold allodynia), increased sensitivity to noxious stimuli (thermal, cold, mechanical hyperalgesia), continuing pain sensation after removal of the stimulation (hyperpathia) or an absence of or deficit in selective sensory pathways (hypoalgesia).

Chronic articular pain conditions include especially rheumatoid arthritis, osteoarthritis, rheumatoid spondylitis, gouty arthritis and juvenile arthritis.

Pain associated with functional bowel disorders includes especially non-ulcer dyspepsia, non-cardiac chest pain and irritable bowel syndrome.

Further, the compounds of formula (I) according to any one of embodiments 1) to 26), or pharmaceutically acceptable salts thereof, are suitable for the prevention or treatment of neurodegenerative and neuroinflammatory diseases. Neurodegenerative and neuro-inflammatory diseases include Alzheimer's disease and other dementing disorders including, but not limited to, Creutzfeldt-Jakob disease (CJD) and new variant Creutzfeldt-Jakob disease (nvCJD); Amyotrophic lateral sclerosis, amyloidosis; multiple sclerosis and other demyelinating syndromes; cerebral atherosclerosis and vasculitis; temporal arteritis; myasthenia gravis; Huntington's disease; Lewy Body dementia; and Parkinson's disease.

Further, the compounds of formula (I) according to any one of embodiments 1) to 26), or pharmaceutically acceptable salts thereof, are suitable for the prevention or treatment of bone and joint diseases. Bone and joint diseases include arthritides such as rheumatoid arthritis, osteoarthritis, gout or crystal arthropathy; intervertebral disc degeneration; temporomandibular joint degeneration; bone remodelling disease such as osteoporosis, Paget's disease or osteonecrosis; polychondritis; scleroderma; mixed connective tissue disorder; spondyloarthropathies; periodontal disease such as periodontitis; arthritides associated with or including osteoarthritis/osteoarthrosis, both primary and secondary to, for example, congenital hip dysplasia; cervical and lumbar spondylitis; Still's disease; seronegative spondyloarthropathies including ankylosing spondylitis, psoriatic arthritis, reactive arthritis and undifferentiated spondyloarthropathy; septic arthritis and other infection-related arthopathies and bone disorders such as tuberculosis, including Potts' disease and Poncet's syndrome; acute and chronic crystal-induced synovitis including urate gout, calcium pyrophosphate deposition disease, and calcium apatite related tendon, bursal and synovial inflammation; Behçet's disease; primary and secondary Sjogren's syndrome; systemic sclerosis and limited scleroderma; systemic lupus erythematosus, mixed connective tissue disease, and undifferentiated connective tissue disease; inflammatory myopathies including dermatomyositits and polymyositis; polymalgia rheumatica; juvenile arthritis including idiopathic inflammatory arthritides of whatever joint distribution and associated syndromes, and rheumatic fever and its systemic complications; vasculitides including giant cell arteritis, Takayasu's arteritis, Churg-Strauss syndrome, polyarteritis nodosa, microscopic polyarteritis, and vasculitides associated with viral infection, hypersensitivity reactions, cryoglobulins, and paraproteins; Familial Mediterranean fever, Muckle-Wells syndrome, and Familial Hibernian Fever, Kikuchi disease; and drug-induced arthalgias, tendonitis, and myopathies including dystrophies and other inflammatory myopathies.

Further, the compounds of formula (I) according to any one of embodiments 1) to 26), or pharmaceutically acceptable salts thereof, are suitable for the prevention or treatment of obstructive diseases of the airways. Obstructive diseases of the airways include asthma, including bronchial, allergic, intrinsic, and extrinsic asthma, exercise-induced, drug-induced (including aspirin and NSAID-induced) and dust-induced asthma, both intermittent and persistent and of all severities, and other causes of airway hyper-responsiveness; chronic obstructive pulmonary disease (COPD); bronchitis, including infectious and eosinophilic bronchitis; emphysema; bronchiectasis; cystic fibrosis; sarcoidosis; farmer's lung and related diseases; hypersensitivity pneumonitis; lung fibrosis, including cryptogenic fibrosing alveolitis, idiopathic interstitial pneumonias, fibrosis complicating anti-neoplastic therapy and chronic infection, including tuberculosis and aspergillosis and other fungal infections; complications of lung transplantation; vasculitic and thrombotic disorders of the lung vasculature, and pulmonary hypertension; antitussive activity including treatment of chronic cough associated with inflammatory and secretory conditions of the airways, and iatrogenic cough; acute and chronic rhinitis including rhinitis medicamentosa, and vasomotor rhinitis; perennial and seasonal allergic rhinitis including rhinitis nervosa (hay fever); nasal polyposis; and acute viral infection including the common cold, and infection due to respiratory syncytial virus, influenza, coronavirus (including SARS) and adenovirus.

Further, the compounds of formula (I) according to any one of embodiments 1) to 26), or pharmaceutically acceptable salts thereof, are suitable for the prevention or treatment of cardiovascular diseases. Cardiovascular diseases include atherosclerosis, affecting the coronary and peripheral circulation; pericarditis; myocarditis; inflammatory and auto-immune cardiomyopathies including myocardial sarcoid; ischaemic reperfusion injuries; endocarditis, valvulitis, and aortitis including infective (for example syphilitic); vasculitides; and disorders of the proximal and peripheral veins including phlebitis and thrombosis, including deep vein thrombosis and complications of varicose veins.

Further, the compounds of formula (I) according to any one of embodiments 1) to 26), or pharmaceutically acceptable salts thereof, are suitable for the prevention or treatment of eye diseases. Eye diseases include blepharitis; conjunctivitis, including perennial and vernal allergic conjunctivitis; iritis; anterior and posterior uveitis; choroiditis; autoimmune, degenerative or inflammatory disorders affecting the retina; ophthalmitis including sympathetic ophthalmitis; sarcoidosis; and infections of the eyes including viral, fungal, and bacterial infections.

Further, the compounds of formula (I) according to any one of embodiments 1) to 26), or pharmaceutically acceptable salts thereof, are suitable for the prevention or treatment of skin diseases. Skin diseases include psoriasis, skin burn, atopic dermatitis, contact dermatitis or other eczematous dermatoses, and delayed-type hypersensitivity reactions; phyto- and photodermatitis; seborrhoeic dermatitis, dermatitis herpetiformis, lichen planus, lichen sclerosus et atrophica, pyoderma gangrenosum, skin sarcoid, discoid lupus erythematosus, pemphigus, pemphigoid, epidermolysis bullosa, urticaria, angioedema, vasculitides, toxic erythemas, cutaneous eosinophilias, alopecia areata, male-pattern baldness, Sweet's syndrome, Weber-Christian syndrome, erythema multiforme; cellulitis, both infective and non-infective; panniculitis; cutaneous lymphomas, non-melanoma skin cancer and other dysplastic lesions; and drug-induced disorders including fixed drug eruptions.

Further, the compounds of formula (I) according to any one of embodiments 1) to 26), or pharmaceutically acceptable salts thereof, are suitable for the prevention or treatment of abdominal and gastrointestinal tract diseases. Abdominal and gastrointestinal tract diseases include hepatitis, including autoimmune, alcoholic and viral hepatitis; fibrosis and cirrhosis of the liver; cholecystitis; pancreatitis, both acute and chronic; non-inflammatory diarrhea; glossitis, gingivitis, periodontitis; oesophagitis, including reflux; eosinophilic gastro-enteritis, mastocytosis, Crohn's disease, colitis including ulcerative colitis, proctitis, pruritis ani; Coeliac disease, irritable bowel disease/syndrome, and food-related allergies which may have effects remote from the gut, for example migraine, rhinitis or eczema; allograft rejection including acute and chronic allograft rejection following, for example, transplantation of kidney, heart, liver, lung, bone marrow, skin or cornea or following blood transfusion; and chronic graft versus host disease;

Further, the compounds of formula (I) according to any one of embodiments 1) to 26), or pharmaceutically acceptable salts thereof, are suitable for the prevention or treatment of genitourinary diseases. Genitourinary diseases include nephritis including interstitial and glomerulonephritis; nephrotic syndrome; cystitis including acute and chronic (interstitial) cystitis and Hunner's ulcer; acute and chronic urethritis, hemorrhagic cystitis, prostatitis, epididymitis, oophoritis and salpingitis; vulvovaginitis; Peyronie's disease; and erectile dysfunction, both male and female.

Further, the compounds of formula (I) according to any one of embodiments 1) to 26), or pharmaceutically acceptable salts thereof, are suitable for the prevention or treatment of cancer. The treatment of cancer includes the treatment of brain tumors, prostate, lung, breast, ovarian, bowel and colon, stomach, pancreatic, skin and bone marrow (including leukaemias) and lymphoproliferative systems, such as non-Hodgkin's and Hodgkin's lymphoma; including the prevention and treatment of metastatic disease and tumor recurrences, and paraneoplastic syndromes.

Further, the compounds of formula (I) according to any one of embodiments 1) to 26), or pharmaceutically acceptable salts thereof, are suitable for the prevention or treatment of other auto-immune and allergic disorders. Other auto-immune and allergic disorders include Hashimoto's thyroiditis, Graves' disease, Addison's disease, diabetes mellitus, idiopathic thrombocytopaenic purpura, eosinophilic fasciitis, hyper-IgE syndrome, and antiphospholipid syndrome.

Further, the compounds of formula (I) according to any one of embodiments 1) to 26), or pharmaceutically acceptable salts thereof, are suitable for the prevention or treatment of other disorders with an inflammatory or immunological component. Other disorders with an inflammatory or immunological component include acquired immune deficiency syndrome (AIDS), leprosy, Sezary syndrome, and paraneoplastic syndromes.

Further, the compounds of formula (I) according to any one of embodiments 1) to 26), or pharmaceutically acceptable salts thereof, are suitable for the prevention or treatment of mood, depression, sleep and anxiety disorders.

Further, the compounds of formula (I) according to any one of embodiments 1) to 26), or pharmaceutically acceptable salts thereof, are suitable for the prevention or treatment of injury induced trauma and spinal cord injury.

Especially, compounds of formula (I) according to any one of embodiments 1) to 26), or pharmaceutically acceptable salts thereof, are suitable for the prevention or treatment of diseases selected from one, several or all of the following groups of diseases and disorders:

-   -   1) Pain, wherein pain refers to acute pain; chronic pain; pain         associated with sprains and strains; chronic articular pain;         pain associated with rheumatic fever; musculoskeletal pain;         lower back and neck pain; inflammatory pain; neuropathic pain;         visceral pain; pain associated with influenza or other viral         infections; pain associated with cancer and tumor invasion;         joint and bone pain; atypical facial pain; pain associated with         migraine, toothache and dysmenorrhea; headache including tension         headache and cluster headaches; pain associated with myocardial         ischemia; pain associated with functional bowel disorders;         sympathetically maintained pain; myositis; pain associated with         cancer chemotherapy; and post operative pain;         -   Neuropathic pain includes especially diabetic neuropathy,             sciatica, non-specific lower back pain, trigeminal             neuralgia, multiple sclerosis pain, fibromyalgia,             HIV-related neuropathy, post-herpetic neuralgia, trigeminal             neuralgia, and pain resulting from physical trauma,             amputation, phantom limb syndrome, spinal surgery, cancer,             toxins or chronic inflammatory conditions. In addition,             neuropathic pain conditions include pain associated with             normally non-painful sensations such as “pins and needles”             (paraesthesias and dysesthesias), increased sensitivity to             touch (hyperesthesia), painful sensation following innocuous             stimulation (dynamic, static, thermal or cold allodynia),             increased sensitivity to noxious stimuli (thermal, cold,             mechanical hyperalgesia), continuing pain sensation after             removal of the stimulation (hyperpathia) or an absence of or             deficit in selective sensory pathways (hypoalgesia);         -   Chronic articular pain conditions include especially             rheumatoid arthritis, osteoarthritis, rheumatoid             spondylitis, gouty arthritis and juvenile arthritis; Pain             associated with functional bowel disorders includes             especially non-ulcer dyspepsia, non-cardiac chest pain and             irritable bowel syndrome;     -   2) Neurodegenerative and neuro-inflammatory diseases such as         Alzheimer's disease and other dementing disorders including, but         not limited to, Creutzfeldt-Jakob disease (CJD) and new variant         Creutzfeldt-Jakob disease (nvCJD); amyloidosis; Amyotrophic         lateral sclerosis, multiple sclerosis and other demyelinating         syndromes; cerebral atherosclerosis and vasculitis; temporal         arteritis; myasthenia gravis; Huntington's disease; Lewy Body         dementia; and Parkinson's disease;     -   3) Bone and joint diseases such as arthritides such as         rheumatoid arthritis, osteoarthritis, gout or crystal         arthropathy; intervertebral disc degeneration; temporomandibular         joint degeneration; bone remodelling disease such as         osteoporosis, Paget's disease or osteonecrosis; polychondritis;         scleroderma; mixed connective tissue disorder;         spondyloarthropathies; periodontal disease such as         periodontitis; Behçet's disease; primary and secondary Sjogren's         syndrome; systemic sclerosis and limited scleroderma; systemic         lupus erythematosus, mixed connective tissue disease, and         undifferentiated connective tissue disease; inflammatory         myopathies including dermatomyositits and polymyositis;         polymalgia rheumatica; juvenile arthritis including idiopathic         inflammatory arthritides of whatever joint distribution and         associated syndromes, and rheumatic fever and its systemic         complications; vasculitides including giant cell arteritis,         Takayasu's arteritis, Churg-Strauss syndrome, polyarteritis         nodosa, microscopic polyarteritis, and vasculitides associated         with viral infection, hypersensitivity reactions, cryoglobulins,         and paraproteins; Muckle-Wells syndrome, and Familial Hibernian         Fever, Kikuchi disease; and drug-induced arthalgias, tendonitis,         and myopathies;     -   4) Obstructive diseases of the airways such as chronic         obstructive pulmonary disease (COPD); cystic fibrosis; lung         emphysema; sarcoidosis; farmer's lung and related diseases; lung         fibrosis, including fibrosis complicating tuberculosis; and         chronic cough associated with inflammatory and secretory         conditions of the airways;     -   5) Cardiovascular diseases such as inflammatory and auto-immune         cardio-myopathies;     -   6) Eye diseases such as degenerative or inflammatory disorders         affecting the retina;     -   7) Skin diseases such as psoriasis, skin burn, atopic         dermatitis, contact dermatitis or other eczematous dermatoses;         and discoid lupus erythematosus;     -   8) Abdominal and gastrointestinal tract diseases such as         fibrosis and cirrhosis of the liver; cholecystitis;         pancreatitis, both acute and chronic; Crohn's disease; colitis         including ulcerative colitis; and irritable bowel         disease/syndrome;     -   9) Genitourinary diseases such as nephritis including         interstitial and glomerulonephritis; nephrotic syndrome; and         cystitis including acute and chronic (interstitial) cystitis;         and     -   10) Other auto-immune and allergic disorders such as Hashimoto's         thyroiditis, Graves' disease, Addison's disease, diabetes         mellitus, idiopathic thrombocytopaenic purpura, eosinophilic         fasciitis, hyper-IgE syndrome, and antiphospholipid syndrome.

Most preferably, compounds of formula (I) according to any one of embodiments 1) to 26), or pharmaceutically acceptable salts thereof, are suitable for the prevention or treatment of diseases selected from one, several or all of the following groups of diseases and disorders:

-   -   1) Pain, wherein pain refers to acute pain; chronic pain; pain         associated with sprains and strains; chronic articular pain;         pain associated with rheumatic fever; musculoskeletal pain         (preferred); lower back and neck pain; inflammatory pain;         neuropathic pain (preferred); visceral pain; pain associated         with influenza or other viral infections; pain associated with         cancer and tumor invasion; joint and bone pain; atypical facial         pain; pain associated with migraine, toothache and dysmenorrhea;         headache including tension headache and cluster headaches; pain         associated with myocardial ischemia; pain associated with         functional bowel disorders; sympathetically maintained pain;         myositis; pain associated with cancer chemotherapy; and post         operative pain;         -   Neuropathic pain includes especially diabetic neuropathy,             sciatica, non-specific lower back pain, trigeminal             neuralgia, multiple sclerosis pain, fibromyalgia,             HIV-related neuropathy, post-herpetic neuralgia, trigeminal             neuralgia, and pain resulting from physical trauma,             amputation, phantom limb syndrome, spinal surgery, cancer,             toxins or chronic inflammatory conditions. In addition,             neuropathic pain conditions include pain associated with             normally non-painful sensations such as “pins and needles”             (paraesthesias and dysesthesias), increased sensitivity to             touch (hyperesthesia), painful sensation following innocuous             stimulation (dynamic, static, thermal or cold allodynia),             increased sensitivity to noxious stimuli (thermal, cold,             mechanical hyperalgesia), continuing pain sensation after             removal of the stimulation (hyperpathia) or an absence of or             deficit in selective sensory pathways (hypoalgesia);         -   Chronic articular pain conditions include especially             rheumatoid arthritis, osteoarthritis, rheumatoid             spondylitis, gouty arthritis and juvenile arthritis; Pain             associated with functional bowel disorders includes             especially non-ulcer dyspepsia, non-cardiac chest pain and             irritable bowel syndrome;     -   2) Rheumatoid arthritis and osteoarthritis;     -   3) Chronic obstructive pulmonary disease (COPD); and     -   4) Crohn's disease.

The invention also relates to the use of a compound of formula (I) according to any one of embodiments 1) to 26) for the preparation of pharmaceutical compositions for the treatment and/or prophylaxis of the above-mentioned diseases.

The present invention also relates to pharmaceutically acceptable salts and to pharmaceutical compositions and formulations of compounds of formula (I) according to any one of embodiments 1) to 26).

A pharmaceutical composition according to the present invention contains at least one compound of formula (I) according to any one of embodiments 1) to 26) (or a pharmaceutically acceptable salt thereof) as the active agent and optionally carriers and/or diluents and/or adjuvants.

The compounds of formula (I) according to any one of embodiments 1) to 26) and their pharmaceutically acceptable salts can be used as medicaments, e.g. in the form of pharmaceutical compositions for enteral (such as especially oral) or parenteral administration (including topical application or inhalation).

The production of the pharmaceutical compositions can be effected in a manner which will be familiar to any person skilled in the art (see for example Remington, The Science and Practice of Pharmacy, 21st Edition (2005), Part 5, “Pharmaceutical Manufacturing” [published by Lippincott Williams & Wilkins]) by bringing the described compounds of formula (I) or their pharmaceutically acceptable salts, optionally in combination with other therapeutically valuable substances, into a galenical administration form together with suitable, non-toxic, inert, therapeutically compatible solid or liquid carrier materials and, if desired, usual pharmaceutical adjuvants.

The present invention also relates to a method for the prevention or treatment of a disease or disorder mentioned herein comprising administering to a subject a pharmaceutically active amount of a compound of formula (I) according to any one of embodiments 1) to 26), or a pharmaceutically acceptable salt thereof.

Any reference to a compound of formula (I), (I-1), (I-2), (I-3), (I-4), (I_(Bn)), (I_(XO)) and (I_(XC)) in this text is to be understood as referring also to the salts (and especially the pharmaceutically acceptable salts) of such compounds, as appropriate and expedient. The preferences indicated for the compounds of formula (I) of course apply mutatis mutandis to the compounds of formula (I-1), of formula (I-2), of formula (I-3), of formula (I-4), of formula (I_(Bn)), of formula (I_(XO)) and of formula (I_(XC)) as well as to the salts and pharmaceutically acceptable salts of the compounds of formula (I), of formula (I-1), of formula (I-2), of formula (I-3), of formula (I-4), of formula (I_(Bn)), of formula (I_(XO)) and of formula (I_(XC)). The same applies to these compounds as medicaments, to pharmaceutical compositions containing these compounds as active principles or to the uses of these compounds for the manufacture of a medicament for the treatment of the diseases according to this invention.

Unless used regarding temperatures, the term “about” (or alternatively “around”) placed before a numerical value “X” refers in the current application to an interval extending from X minus 10% of X to X plus 10% of X, and preferably to an interval extending from X minus 5% of X to X plus 5% of X. In the particular case of temperatures, the term “about” (or alternatively “around”) placed before a temperature “Y” refers in the current application to an interval extending from the temperature Y minus 10° C. to Y plus 10° C., and preferably to an interval extending from Y minus 5° C. to Y plus 5° C. Besides, the term “room temperature” (RT) as used herein refers to a temperature of about 25° C. Whenever the word “between” is used to describe a numerical range, it is to be understood that the end points of the indicated range are explicitly included in the range.

For example: if a temperature range is described to be between 40° C. and 80° C., this means that the end points 40° C. and 80° C. are included in the range; or if a variable is defined as being an integer between 1 and 4, this means that the variable is the integer 1, 2, 3, or 4.

The compounds of Formula (I) can be manufactured by the methods given below, by the methods given in the Examples or by analogous methods. Optimum reaction conditions may vary with the particular reactants or solvents used, but such conditions can be determined by a person skilled in the art by routine optimisation procedures.

If not indicated otherwise, the generic groups R¹, R², R³, R⁴, R⁵, n, m, p and X are as defined for formula (I). Other abbreviations used are defined in the experimental section.

In some instances the generic groups R¹, R², R³, R⁴, R⁵, n, m, p and X might be incompatible with the assembly illustrated in the schemes below and will therefore require the use of protecting groups (PG). The use of protecting groups is well known in the art (see for example “Protective Groups in Organic Synthesis”, T. W. Greene, P. G. M. Wuts, Wiley-Interscience, 1999). For the purposes of this discussion, it will be assumed that such protecting groups are as necessary in place.

Preparation of Compounds of Formula (I)

Compounds of formula (I) can be prepared by reaction of a carboxylic acid (II) with an amine (III) using standard amide coupling reagents such as EDC.HCl/HOBt, SiliaBond® carbodiimide/HOAt, HATU/HOAt or PyBOP and a base like DIPEA in a solvent like DCM, THF or DMF preferably at temperatures between RT and 45° C. (scheme 1).

Compounds of formula (I), wherein R⁴ represents CF₃, can be prepared via a Pd(0) mediated procedure from compounds of formula (I), wherein R⁴ represents bromo, using Pd₂(dba)₃, CuI, Ph₃As and methyl 2,2-difluoro-2-(fluorosulfonyl)acetate in a degassed solvent, such as DMF at temperatures between 80° C. and 120° C.

Compounds of formula (II), if not commercially available, can be prepared following the procedures outlined in the schemes below and in the experimental part.

Compounds of formula (II), wherein X represents —CH₂— and R⁴ represents hydrogen, (C₁-C₄)alkyl, phenyl, or amino can be prepared from a methyl ester (IV) like, for instance, methyl cyclohex-2-enecarboxylate (Bioorg. Med. Chem. 1999, 7, 1505-1511) by a bromohydrin-formation/oxidation sequence using (1) NBS in a THF/H₂O mixture at temperatures around RT and (2) an oxidant such as DMP in a solvent like DCM at temperatures around RT to form α-bromoketone (V) (scheme 2). Condensation with thiourea or a thioamide derivative (VI) (R⁴ represents hydrogen, (C₁-C₄)alkyl, phenyl or NH₂), in a solvent such as dioxane or EtOH at temperatures between 60° C. and 110° C. provide thiazoles (VII). If not commercially available, thioamides (VI) can be prepared from the corresponding amides with P₄S₁₀ or Lawesson's reagent in a solvent such as dioxane or toluene at temperatures between 60° C. and 110° C. Saponification of the methyl ester (VII) can be performed under standard conditions such as LiOH in a THF/MeOH/H₂O mixture, preferably at temperatures between 0° C. and 45° C. to form compounds of formula (IIa).

Compounds of formula (II), wherein R⁴ represents chloro or bromo, respectively, can be prepared via a Sandmeyer type reaction of compounds of formula (VII), wherein R⁴ represents amino using Cu(II)Cl₂ or Cu(II)Br₂, respectively, and tBu-nitrite in MeCN at temperatures between RT and 60° C., followed by saponification with a base, such as LiOH in a solvent mixture like THF/MeOH/H₂O at temperatures around RT (scheme 2).

Compounds of formula (II), wherein R⁴ represents fluoro can be prepared by treating compounds of formula (VII), wherein R⁴ represents amino with HBF₄ and NOBF₄ in a solvent like Et₂O at temperatures between −50° C. and RT, followed by saponification with a base, such as LiOH in a solvent mixture like THF/MeOH/H₂O at temperatures around RT (scheme 2).

Alternatively, compounds of formula (II), wherein X represents —CH₂— and R⁴ represents hydrogen or amino, can be prepared from the corresponding cycloalk-2-enone (VIII) by (1) addition of TMS-CN, catalyzed by Ni(cod)₂ and Gd(OTf)₃ in the presence of norbornadiene in a solvent such as THF at temperatures around RT and (2) bromination of the resulting silylenolether using an electrophilic bromine source such as NBS in a THF/H₂O mixture at temperatures around 0° C. to form α-bromoketone (IX) (scheme 3). The aminothiazoles (X) are prepared by condensation of the corresponding α-bromoketone (IX) with thiourea in a solvent such as dioxane at temperatures between 60° C. and 100° C. Hydrolysis using aq. conc. HCl at temperatures between 60° C. and 100° C. form carboxylic acids (IIb), wherein R⁴ represents amino. Optionally, aminothiazoles of formula (X) can be diazotized utilizing tBu-nitrite in THF at temperatures between 60° C. and 80° C. to provide the corresponding thiazoles. Hydrolysis of the nitrile group using aq. conc. HCl at temperatures between 60° C. and 100° C. form carboxylic acids (IIb), wherein R⁴ represents hydrogen.

Compounds of formula (II), wherein X represents —O—, n represents 2 or 3, and R₄ represents hydrogen, can be prepared by (1) addition of 3-(tert-butyldimethylsilyloxy)propanal or 4-(tert-butyldimethylsilyloxy)butanal, respectively to 5-lithiated 2,4-dichlorothiazole (obtained from 2,4-dichlorothiazole and a strong non-nucleophilic base like LDA in a solvent like THF at temperatures between −20° C. and RT) in a solvent such as THF at −78° C. and (2) protection of the resulting hydroxy group using DHP and a catalyst like PPTS in a solvent such as DCM at temperatures between RT and reflux to form intermediate (XII) (scheme 4). Cyclization precursor (XIII) can be prepared by (1) dechlorination using an alkyllithium species such as nBuLi in a solvent like THF at temperatures between −100° C. and −40° C. and (2) treatment with a fluoride source such as TBAF in a solvent like THF at temperatures between 0° C. and RT. Cyclization to compounds of formula (XIV) can be performed with a base such as NaH or KOtBu in a solvent like DMF or tBuOH, respectively, or through a palladium mediated procedure using Pd(OAc)₂, rac-2-(di-tert-butylphosphino)-1,1′-binaphthyl and a base like Cs₂CO₃ in a solvent such as toluene at temperatures between 80° C. and 110° C. Compounds of formula (IIc) are obtained by (1) removal of the THP protecting group under acidic conditions using, for instance, catalytic amounts of PTSA in a solvent mixture like THF/H₂O at temperatures around RT, (2) a Mitsunobu reaction, and (3) hydrolysis of the nitrile using aq. conc. HCl at temperatures between 60° C. and 100° C. The Mitsunobu reaction can be carried out with acetone cyanohydrin, (nBu)₃P and 1,1′-(azodicarbonyl)dipiperidine in a solvent like THF at temperatures between 0° C. and RT.

Compound of formula (II), wherein X represents —O—, n represents 1, and R⁴ represents hydrogen, can be prepared by reaction of 4-bromothiazole (XV) with the sodium salt of DL-1,2-isoproylideneglycerol at temperatures between 120° C. and 150° C. and subsequent bromination with an electrophilic bromine source such as NBS in a solvent like MeCN at temperatures between 0° C. and RT (scheme 5). The resulting 5-bromothiazole (XVI) is sequentially treated with (1) catalytic amounts of an acid such as PPTS in a solvent like MeOH at temperatures around reflux, (2) trimethyl orthoformate in a solvent like DCM at temperatures around RT, (3) AcBr in a solvent like DCM at temperatures around RT, and (4) a carbonate base such as K₂CO₃ in a solvent like MeOH at temperatures around RT to form oxirane (XVII). At temperatures between −78° C. and RT, a soln. of oxirane (XVII) in an ether solvent like THF is consecutively treated with an alkyl lithium reagent like nBuLi, a trialkylsilyl chloride like TIPSCl, and again with an alkyl lithium reagent like nBuLi to form dihydrofurothiazole (XVIII). A two-step oxidation procedure utilizing (1) Dess Martin's reagent in a solvent like DCM at temperatures between 0° C. and RT and (2) sodium chlorite in a buffered aq. solution with tBuOH as co-solvent and 2-methyl-2-butene as scavenger at temperatures around 0° C. provides carboxylic acid (XIX). Removal of the silyl protecting group to form a compound of formula (IId) can be performed with a fluoride source such as TBAF in a solvent like THF at temperatures between 0° C. and RT.

Compounds of formula (III), if not commercially available, can be prepared following the procedures outlined in the schemes below and in the experimental part.

Compounds of formula (III), wherein R⁵ represents hydrogen and m represents 1 or 2 can be prepared from halides (XX), wherein X is preferably bromide or iodide and R^(a) represents substituted phenyl-(C₁-C₂)alkyl, via a cyanation with NaCN or KCN in a solvent like CH₃CN, EtOH or DMF preferably at temperatures between RT and 65° C. (scheme 6). The formed nitriles (XXI) can be reduced by hydrogenation with Raney Nickel as catalyst in a solvent such as NH₃ in MeOH. Alternatively, a reducing agent such as BH₃ in THF preferably at temperatures between 0° C. and 65° C. or such as LiAlH₄ in a solvent like THF or Et₂O preferably at temperatures between 0° C. and RT can be used to form amines (IIIa). In analogy, compounds of formula (III), wherein R¹ and R⁵ represent hydrogen and m represents 0 (such as benzyl) can be prepared by reduction of nitriles (XXI) wherein R^(a) represents substituted phenyl (and notably by reduction with BH₃ in THF).

Alternatively, nitriles of formula (XXI) can be synthesized starting from carboxylic acids of formula (XXII), wherein R^(a) represents substituted phenyl-(C₁-C₂)alkyl or substituted phenyl, by preparing the corresponding carboxamides (XXIII) under standard amide formation conditions, such as EDC.HCl/HOBt in a solvent like DCM or DMF and ammonia (scheme 6). The carboxamides (XXIII) can be dehydrated to nitriles (XXI) using TFAA as dehydrating agent in the presence of Et₃N in a solvent such as DCM preferably at temperatures between 0° C. and RT.

Alternatively, compounds of formula (III), wherein R⁵ represents hydrogen and m represents 0, 1, or 2 can be prepared in two steps from aldehydes of formula (XXIV), wherein R^(a) represents substituted phenyl-(C₁-C₂)alkyl or substituted phenyl, via formation of the corresponding oximes (XXV) using hydroxylamine hydrochloride under standard conditions such as in a solvent like EtOH at temperatures between RT and 60° C. followed by a reduction of the respective oximes using zinc dust in a solvent like acetic acid preferably at temperatures between 0° C. and RT or by using BH₃ in a solvent like THF preferably at temperatures between RT and 60° C. (scheme 6).

Compounds of formula (III), wherein R⁵ represents methyl, can be synthesized by a reductive amination reaction of a primary amine of formula (IIIa) using formaldehyde via catalytic hydrogenation in the presence of a suitable catalyst such as PtO₂ or Raney Nickel in a solvent like EtOH preferably at temperatures between RT and 45° C. or in the presence of a reducing agent such as NaBH₄ or NaBH(OAc)₃ in a solvent like MeOH or ClCH₂CH₂Cl at temperatures between RT and 65° C. Alternatively, methylation with MeI in the presence of a base such as NaH in a suitable solvent like THF or DMF at temperatures between 0° C. and RT can be done (scheme 6).

Compounds of formula (XXVI), wherein R³ is a (C₁-C₄)alkyl, (C₃-C₆)cycloalkyl, (C₁-C₄)alkoxy, hydroxy-(C₂-C₃)alkoxy, hydroxy-(C₁-C₃)alkyl, (C₁-C₂)alkoxy-(C₁-C₂)alkyl or hydroxy-(C₂-C₃)alkoxy-(C₁-C₂)alkyl substituent and wherein “aryl” means a phenyl group as depicted in formula (III), which phenyl is (1) optionally substituted with one further R³ group, (2) substituted with R² and (3) substituted with R^(b), can be prepared following the procedures outlined in scheme 7. R^(b) represents a precursor to the R⁵NH—(CH₂)_(m)—CHR¹-moiety of compounds of formula (III) such as cyano, cyano-(C₁-C₂)alkyl, formyl, or PGN-(C₁-C₃)alkyl wherein PG represents an amine protecting group. In case R^(b) represents a cyano or cyano-(C₁-C₂)alkyl group, compounds of formula (III) may be prepared from compounds of formula (XXVI) according to the procedure described for the transformation of compounds of formula (XXI) to compounds of formula (IIIa) (scheme 6). In case R^(b) represents a formyl group, compounds of formula (III) may be prepared from compounds of formula (XXVI) according to the procedure described for the transformation of compounds of formula (XXIV) to compounds of formula (IIIa) (scheme 6). In case R^(b) represents a PGN-(C₁-C₃)alkyl group wherein PG represents a phthalimide protecting group, compounds of formula (III) may be prepared from compounds of formula (XXVI) by removal of the phthalimide group with, for instance, hydrazine in a solvent like EtOH at temperatures around RT.

Compounds of formula (XXVI), wherein R³ is (C₁-C₄)alkyl or (C₃-C₆)cycloalkyl and wherein “aryl” means a phenyl group as depicted in formula (III), which phenyl is (1) optionally substituted with one further R³ group, (2) substituted with R² and (3) substituted with R^(b), wherein R^(b) represents PGN-(C₁-C₃)alkyl and PG represents an amine protecting group such as a phthalimide protecting group, can be prepared from compounds of formula (XXVII) wherein X, as a precursor of R³, is a halogen atom (preferably bromide) by a Suzuki type coupling reaction. The Suzuki reaction can be carried out for instance with (C₁-C₄)alkylboronic acid derivatives or (C₃-C₆)cycloalkylboronic acid derivatives (e.g. ethylboronic acid) in the presence of a suitable base such as K₃PO₄ and a palladium catalyst like palladium acetate with triphenylphosphine in a solvent such as toluene or dioxane preferably at temperatures between RT and 100° C.

Compounds of formula (XXVI), wherein R³ is (C₁-C₄)alkoxy or hydroxy-(C₂-C₃)alkoxy and wherein “aryl” means a phenyl group as depicted in formula (III), which phenyl is (1) optionally substituted with one further R³ group, (2) substituted with R² and (3) substituted with R^(b), wherein R^(b) represents formyl, cyano or cyano-(C₁-C₂)alkyl, can be prepared from the respective phenols of formula (XXVIII) by an alkylation reaction using a base like K₂CO₃ or Cs₂CO₃ in a solvent such as DMF in the presence of the appropriate alkylating agent such as (C₁-C₄)alkyl-L or hydroxy-(C₂-C₃)alkyl-L, wherein L represents a leaving group such as bromide or iodide (e.g., iodomethane).

Compounds of formula (XXVI), wherein R³ is hydroxymethyl, (C₁-C₂)alkoxymethyl, or hydroxy-(C₂-C₃)alkoxymethyl and wherein “aryl” means a phenyl group as depicted in formula (III), which phenyl is (1) optionally substituted with one further R³ group, (2) substituted with R² and (3) substituted with R^(b), wherein R^(b) represents cyano or cyano-(C₁-C₂)alkyl, can be prepared from the respective methylated compounds of formula (XXIX) by (1) a Wohl-Ziegler type bromination reaction using standard conditions like NBS in the presence of catalytical amounts of AIBN in a solvent such as chlorobenzene preferably at temperatures between 40° C. and 80° C. and (2) followed by a substitution reaction of the respective benzyl bromide with for instance NaOH, NaOMe, NaOEt or AcO—(C₂-C₃)alkyl-ONa.

Compounds of formula (XXVI), wherein R³ is hydroxyethyl, (C₁-C₂)alkoxyethyl or hydroxy-(C₂-C₃)alkoxyethyl and wherein “aryl” means a phenyl group as depicted in formula (III), which phenyl is (1) optionally substituted with one further R³ group, (2) substituted with R² and (3) substituted with R^(b), wherein R^(b) represents cyano or cyano-(C₁-C₂)alkyl, can be prepared from compounds of formula (XXVII), wherein X represents halogen by (1) a Stille type coupling reaction using for instance ethyl tributylstannylacetate in the presence of a suitable catalyst such as dichlorobis(tri-o-tolylphosphine)palladium optionally in combination with zinc bromide in a solvent such as DMF preferably at temperatures between RT and 80° C. and (2) followed by a reduction of the corresponding ester with NaBH₄ in a solvent such as diglyme or with LiAlH₄ in a solvent such as THF preferably at temperatures between 0° C. and RT and optionally, (3) followed by an alkylation reaction using a base like K₂CO₃ or Cs₂CO₃ in a solvent such as DMF in the presence of the appropriate alkylating agent such as (C₁-C₂)alkyl-L or hydroxy-(C₂-C₃)alkyl-L, wherein L represents a leaving group such as bromide or iodide (e.g., iodomethane).

Compounds of formula (XXVI), wherein R³ is hydroxypropyl and wherein “aryl” means a phenyl group as depicted in formula (III), which phenyl is (1) optionally substituted with one further R³ group, (2) substituted with R² and (3) substituted with R^(b), wherein R^(b) represents cyano or cyano-(C₁-C₂)alkyl, can be prepared from compounds of formula (XXVII), wherein X represents halogen by (1) a Heck type coupling using for instance methyl acrylate in the presence of a base such as Et₃N and a suitable palladium catalyst like tetrakis(triphenylphosphine)palladium in a solvent such as DMF preferably at temperatures between RT and 100° C. and (2) followed by a reduction of the corresponding unsaturated ester with NaBH₄ in a solvent such as diglyme or with LiAlH₄ in a solvent such as THF preferably at temperatures between 0° C. and RT.

Compounds of formula (III), wherein R⁵ represents hydrogen, m represents 0, and R¹ represents hydroxy-(C₁-C₂)alkyl can be prepared from amino acid derivatives (XXX), wherein R^(c) represents phenyl, which is substituted with R² and optionally substituted with one or two R³, and R represents (C₁-C₄)alkyl (preferably methyl or ethyl), via reduction with LiAlH₄ or BH₃ in a solvent such as THF or by using NaBH₄ in MeOH preferably at temperatures between 0° C. and RT to form the respective aminoalcohols (scheme 8). Compounds of formula (IIId), wherein R⁵ represents methyl, can be synthesized under the methylation conditions as described for the synthesis of compounds of formula (IIIb).

Compounds of formula (III), wherein R⁵ represents hydrogen, m represents 0, and R¹ and R² together represent —CH₂CH₂— or —CH₂CH₂CH₂— can be prepared in two steps from ketones (XXXI), wherein R³ represents halogen and p represents 0, 1, or 2 via (1) oxime formation using standard conditions such as O-methylhydroxylamine in a solvent like MeOH optionally in the presence of NaOAc to form compounds of formula (XXXII) and (2) a hydrogenation reaction in the presence of a reducing agent such as BH₃ in a solvent like THF preferably at temperatures between RT and 60° C. to form amines of formula (Ille), wherein m represents 0 and R³ represents halogen (scheme 9). Compounds of formula (IIIf), wherein R⁵ represents methyl, can be prepared under the methylation conditions mentioned above.

Compounds of formula (III), wherein R⁵ represents hydrogen, m represents 1 or 2, and R¹ and R² together represent —CH₂CH₂— or —CH₂CH₂CH₂— can be prepared by reduction of nitriles (XXXIII), wherein q represents 0 or 1 and R³ represents halogen with H₂ and Raney Nickel as catalyst in a solvent such as NH₃ in MeOH (scheme 9). Alternatively, a reducing agent such as BH₃ in THF preferably at temperatures between 0° C. and 65° C. or such as LiAlH₄ in a solvent like THF or Et₂O preferably at temperatures between 0° C. and RT can be used to form amines of formula (Ille), wherein m represents 1 or 2. Compounds of formula (IIIf), wherein R⁵ represents methyl, can be prepared under the methylation conditions mentioned above. Nitriles (XXXIII), wherein q represents 0 can be prepared from ketones (XXXI), wherein R³ represents halogen via a van Leusen reaction utilizing TosMIC and a base like tBuOK in a solvent such as DME/EtOH at temperatures between 0° C. and RT. Nitriles (XXXIII), wherein q represents 1 can be prepared in two steps from ketones (XXXI), wherein R³ represents halogen via (1) Homer-Wadsworth-Emmons reaction utilizing (EtO)₂P(═O)CH₂CN and a base such as NaH or tBuOK in a solvent like THF at temperatures between 0° C. and RT and (2) reduction with H₂ and a catalyst like Pd on charcoal in a solvent like MeOH at temperatures between RT and 65° C.

Alternatively, compounds of formula (III), wherein R¹ and R⁵ represent hydrogen and m represents 0 can be prepared from aniline derivatives (XXXIV), wherein aryl means phenyl which is substituted with R² and optionally substituted with R³ by a Meerwein arylation type reaction using a Cu(II) salt like CuCl₂, tBu-nitrite and 1,1-dichloroethylene in a solvent like MeCN followed by refluxing in MeOH in the presence of sodium methoxide and subsequent treatment with concentrated H₂SO₄, preferably at a temperature between RT and 90° C. (scheme 10). Hydrolysis of the obtained ester derivatives using standard conditions such as NaOH or LiOH in a mixture of water and a suitable organic solvent such as MeOH, EtOH or THF gives the corresponding compounds of formula (XXXV). A Curtius rearrangement using DPPA in a suitable solvent like toluene preferably at temperatures around 100° C. followed by treatment with water or potassium trimethylsilanolate at temperatures around 0° C. leads to compounds of formula (IIIg), wherein R⁵ is hydrogen. Compounds of formula (IIIh), wherein R⁵ represents methyl can be prepared under the methylation conditions mentioned above.

Experimental Part

Abbreviations (as used herein and in the description above)

-   Ac acetyl -   AlBN azobisisobutyronitrile -   anh. anhydrous -   aq aqueous -   Ar argon -   nBu butyl -   tBu tert-butyl -   CC column chromatography -   cod 1,5-cyclooctadiene -   conc. concentrated -   comb. combined -   dba dibenzylideneacetone -   DCM dichloromethane -   DHP 3,4-dihydro-2H-pyran -   DIPA diisopropylamine -   DIPEA diisopropylethylamine -   DME dimethoxyethane -   DMF dimethylformamide -   DMP Dess-Martin periodinane -   DMSO dimethyl sulfoxide -   DPPA diphenylphosphoryl azide -   Et ethyl -   EDC. HCl N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide     hydrochloride -   h hour(s) -   HATU O-(7-azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium     hexafluorophosphate -   Hept heptane -   HOAt 1-hydroxy-7-azabenzotriazole -   HOBt 1-hydroxybenzotriazole hydrate -   HV high vacuum -   LC-MS liquid chromatography-mass spectrometry -   LDA lithium diisopropylamide -   M molar -   Me methyl -   MeCN acetonitrile -   min minute(s) -   NBS N-bromosuccinimide -   NMR nuclear magnetic resonance -   org. organic -   PG protecting group -   Ph phenyl -   PPTS pyridinium p-toluenesulfonate -   PTSA p-Toluenesulfonic acid -   PyBOP (benzotriazol-1-yloxy)tripyrrolidinophosphonium     hexafluorophosphate -   RT room temperature -   sat. saturated -   soln. solution -   TBAF tetra-n-butylammonium fluoride -   TBS tert-butyldimethylsilyl -   Tf trifluoromethanesulfonyl -   TFA trifluoroacetic acid -   TFAA trifluoroacetic anhydride -   THF tetrahydrofuran -   THP tetrahydropyran -   TIPS triisopropylsilyl -   TMS trimethylsilyl -   TosMIC toluenesulfonylmethyl isocyanide -   t_(R) retention time -   UV ultra-violet -   Vis visible

A. Characterization Methods Used Nuclear Magnetic Resonance:

Brucker Avance 400, 400 MHz; chemical shifts are given in ppm relative to the solvent used; multiplicities: s=singlet, d=doublet, t=triplet, q=quadruplet, m=multiplet, br=broad, coupling constants are given in Hz.

Analytical HPLC-MS Methods:

HPLC-MS analyses were performed on a Thermo MSQ mass spectrometer with a Dionex Ultimate HPG-3000 pump and a Dionex Ultimate 3000 photodiode array detector.

(1) eluents: A: H₂O+0.05% HCOOH, CH₃CN; gradient: 5% B→95% B (0.0 min-2.0 min), 95% B (2.0 min-2.3 min); flow: 1.8 mL/min; detection: UV/Vis+MS; t_(R) is given in min; column: Ascentis Express C18; 2.7 um, 2.1×50 mm.

(2) eluents: A: H₂O+0.05% NH₄OH, CH₃CN; gradient: 5% B→95% B (0.0 min-2.0 min), 95% B (2.0 min-2.3 min); flow: 1.8 mL/min; detection: UV/Vis+MS, t_(R) is given in min; column: Ascentis Express C18, 2.7 um, 2.1×50 mm.

HPLC-MS analyses were performed on a Thermo MSQ Plus mass spectrometer with a Dionex HPG-3200RS pump (or Agilent G4220A) and a Dionex DAD-3000RS photodiode array detector (or Agilent G4212A).

(3) eluents: A: H₂O+0.04% TFA, CH₃CN; gradient: 5% B→95% B (0.0 min-1.0 min), 95% B (1.0 min-1.5 min); flow: 4.5 mL/min; detection: UV/Vis+MS, t_(R) is given in min; column: Waters XBridge C18, 2.5 um, 4.6×30 mm.

(4) eluents: A: H₂O+0.04% TFA, B: CH₃CN; gradient: 2% B→40% B (0.0 min-0.8 min), 40% B→95% B (0.8 min-1.2 min), 95% B (1.2 min-1.5 min); flow: 4.5 mL/min; detection: UV/Vis+MS, t_(R) is given in min; column: Waters XBridge C18, 2.5 um, 4.6×30

(5) eluents: A: H₂O+0.04% TFA, B: CH₃CN; gradient: 5% B→95% B (0.0 min-1.0 min), 95% B (1.0 min-1.5 min); flow: 4.5 mL/min; detection: UV/Vis+MS, t_(R) is given in min; column: Waters Atlantis T3, 5 um, 4.6×30 mm.

Purification Methods Used Preparative LC-MS Methods:

Preparative HPLC/MS purifications were performed on a Waters system, equipped with a binary gradient module (2545), a HPLC pump (515), a photodiode array detector (2998) and a mass detector (3100).

eluents acidic: A: H₂O+0.1% HCOOH, B: CH₃CN+0.1% HCOOH; eluents basic: A: H₂O+0.1% NH₄OH, B: CH₃CN+0.1% NH₄OH; flow: 40 mL/min; column: Waters XBridge C18, 5 um 19×50 mm.

normal gradient: 75% A (0.0 min-0.2 min), 75% A→65% A (0.2 min-0.3 min), 65% A→35% A (0.3 min-3.2 min), 35% A 5% A (3.2 min-3.3 min), 5% A (3.3 min-4.3 min).

polar gradient: 90% A (0.0 min-0.2 min), 90% A→80% A (0.2 min-0.3 min), 80% A→50% A (0.3 min-3.2 min), 50% A→5% A (3.2 min-3.3 min), 5% A (3.3 min-4.3 min).

acidic basic polar gradient (A) (C) normal gradient (B) (D)

Preparative HPLC/MS purifications were performed on a Gilson HPLC system, equipped with a Gilson 215 autosampler, Gilson 333/334 pumps, Dionex MSQ Plus detector system, and a Dionex UVD340U (or Dionex DAD-3000) UV detector.

eluents acidic: A: CH₃CN, B: H₂O+0.5% HCOOH; eluents basic: A: CH₃CN, B: H₂O+0.5% NH₄OH; flow: 75 mL/min; column: Waters XBridge C18, 10 um, 30×75 mm.

normal gradient: 80% B→5% B (0.0 min-4.0 min), 5% B (4.0 min-6.0 min).

polar gradient: 90% B→5% B (0.0 min-4.0 min), 5% B (4.0 min-6.0 min).

acidic basic polar gradient (E) (G) normal gradient (F) (H)

Method (I): eluents: A: CH₃CN, B: H₂O+0.5% HCOOH; gradient: 100% B (0.0 min-1.0 min), 100% B 80% B (1.0 min-3.5 min), 80% B→5% B (3.5 min-4.0 min), 5% B (4.0 min-6.0 min); flow: 75 mL/min; column: Waters Atlantis T3 OBD, 10 um, 30×75 mm.

Method (J): eluents: A: CH₃CN, B: H₂O+0.5% HCOOH gradient: 90% B→5% B (0.0 min-4.0 min), 5% B (4.0 min-6.0 min); flow: 75 mL/min; column: Waters Atlantis T3 OBD, 10 um, 30×75 mm.

Column Chromatography (CC) (Method K):

CC was performed using silica gel 60 Merck (0.063-0200 mm) or using pre-packed cartridges (SNAP KP-Sil™) from Biotage®.

Extraction (Method L, M):

(L): the reaction mixture was diluted with DCM, washed with aq. sat. NaHCO₃ and brine, dried over MgSO₄, and conc. in vacuo. The residue was suspended in DCM and filtrated.

(M): the reaction mixture was filtrated, the residue was dissolved in DCM, washed with aq. sat. NaHCO₃, aq. citric acid and brine, dried over MgSO₄, and conc. in vacuo.

Trituration (Method N):

(N): the residue was suspended in DCM and filtrated.

Racemates can be separated into their enantiomers by preparative chiral HPLC.

The following examples illustrate the invention but do not at all limit the scope thereof.

A. Preparation of Precursors and Intermediates A.1. Synthesis of carboxylic acid derivatives (II) A.1.1. Synthesis of 4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxylic acid A.1.1.1. Methyl 2-bromo-3-oxocyclohexanecarboxylate

At 0° C., NBS (9.08 g, 51.0 mmol) was added to a soln. of methyl cyclohex-2-enecarboxylate (5.96 g, 42.5 mmol) [Bioorg. Med. Chem. 1999, 7, 1505-1511] in THF/H₂O (500 mL, 9:1). The mixture was allowed to warm to RT and stirred for 2 h. Subsequently, aq. sat. Na₂S₂O₃ and aq. sat. NaHCO₃ were added and the mixture was conc. in vacuo.

The residue was partitioned between EtOAc and aq. sat. NaHCO₃. The org. layer was washed multiple times with aq. sat. NaHCO₃ and brine, dried over MgSO₄, and conc. in vacuo.

The residue was dissolved in DCM (386 mL) and DMP (24.54 g, 57.9 mmol) was added at 0° C. The mixture was allowed to warm to RT and stirred for 2 h. Subsequently, the mixture was quenched by the addition of aq. sat. Na₂S₂O₃ and aq. sat. NaHCO₃, diluted with H₂O, and extracted with DCM. The comb. org. layers were washed with brine, dried over MgSO₄, and conc. in vacuo. Purification by means of CC (0-0.5% MeOH/DCM) provided a yellow oil.

¹H-NMR (CDCl₃) δ: 4.75 (dd, J=6.7, 1.0 Hz, 0.2H), 4.65 (d, J=3.7 Hz, 0.8H), 3.75, 3.75 (2s, 3H), 3.16-3.01, 2.85-2.79, 2.47-2.39, 2.35-2.29 (4m, 3H), 2.28-1.95, 1.88-1.79, 1.72-1.59 (3m, 4H).

A.1.1.2. Methyl 4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxylate

At 0° C., finely crushed P₄S₁₀ (9.35 g, 21.0 mmol) was added to a mixture of formamide (4.73 g, 105.0 mmol) in dioxane (28.5 mL). Subsequently, the mixture was stirred in a sealed vial at 100° C. for 1.5 h, cooled to RT and filtrated. The filtrate was added to a mixture of methyl 2-bromo-3-oxocyclohexanecarboxylate (2.06 g, 8.76 mmol) in dioxane (16.5 mL) and stirred in a sealed vial at 80° C. overnight. The mixture was quenched by the addition of aq. sat. NaHCO₃ and extracted with EtOAc. The comb. org. layers were washed with brine, dried over MgSO₄, and conc. in vacuo. Purification by means of CC (10-40% EtOAc/Hept) provided a yellow oil.

LC-MS (3): t_(R)=0.47 min; [M+H]+: 198.16.

A.1.1.3. 4,5,6,7-Tetrahydrobenzo[d]thiazole-7-carboxylic acid

A mixture of methyl 4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxylate (1.22 g, 6.11 mmol) and LiOH.H₂O (0.39 g, 9.17 mmol) in THF/MeOH/H₂O (60 mL, 3:1:1) was stirred at RT for 75 min. The mixture was acidified to pH=3 and extracted with DCM. The comb. org. layers were dried over MgSO₄ and conc. in vacuo to provide a yellow solid.

LC-MS (3): t_(R)=0.32 min; [M+H]+: 184.21.

A.1.2. Synthesis of 2-amino-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxylic acid A.1.2.1. Methyl 2-amino-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxylate

A soln. of methyl 2-bromo-3-oxocyclohexanecarboxylate (1.00 g, 4.25 mmol) and thiourea (0.36 g, 4.68 mmol) in EtOH (16 mL) was stirred at 70° C. overnight. Subsequently, the mixture was quenched with aq. sat. NaHCO₃ and extracted with EtOAc. The comb. org. layers were washed with brine, dried over MgSO₄, and conc. in vacuo. Purification by means of CC (0-1% MeOH/DCM) provided a yellow solid.

LC-MS (3): t_(R)=0.37 min; [M+H]+: 213.19.

A.1.2.2. 2-Amino-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxylic acid

A mixture of methyl 2-amino-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxylate (52 mg, 0.24 mmol) and LiOH.H₂O (12 mg, 0.29 mmol) in THF/MeOH/H₂O (2.5 mL, 3:1:1) was stirred at RT for 2 h. The mixture was neutralized with aq. HCl and conc. in vacuo. The crude yellow solid was used without any further purification.

LC-MS (3): t_(R)=0.28 min; [M+H]+: 199.14.

A.1.3. Synthesis of 2-methyl-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxylic acid A.1.3.1. Methyl 2-methyl-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxylate

A soln. of methyl 2-bromo-3-oxocyclohexanecarboxylate (150 mg, 0.64 mmol) and thioacetamide (53 mg, 0.70 mmol) in EtOH (3 mL) was stirred at 85° C. overnight. Subsequently, the mixture was quenched with aq. sat. NaHCO₃ and extracted with EtOAc. The comb. org. layers were washed with brine, dried over MgSO₄, and conc. in vacuo. Purification by means of CC (0-40% EtOAc/Hept) provided a yellow oil.

LC-MS (3): t_(R)=0.44 min; [M+H]+: 212.17.

A.1.3.2. 2-Methyl-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxylic acid

A mixture of methyl 2-methyl-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxylate (59 mg, 0.28 mmol) and LiOH.H₂O (14 mg, 0.33 mmol) in THF/MeOH/H₂O (2.5 mL, 3:1:1) was stirred at RT for 2 h. The mixture was acidified to pH=3 and extracted with EtOAc. The comb. org. layers were dried over MgSO₄, and conc. in vacuo.

LC-MS (3): t_(R)=0.30 min; [M+H]+: 198.17.

A.1.4. Synthesis of 2-phenyl-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxylic acid A.1.4.1. Synthesis of methyl 2-phenyl-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxylate

A soln. of methyl 2-bromo-3-oxocyclohexanecarboxylate (100 mg, 0.43 mmol) and thiobenzamide (64 mg, 0.47 mmol) in EtOH (2 mL) was stirred at 85° C. overnight. Subsequently, the mixture was quenched with aq. sat. NaHCO₃ and extracted with EtOAc. The comb. org. layers were washed with brine, dried over MgSO₄, and conc. in vacuo. Purification by means of CC (2-15% EtOAc/Hept) provided a yellow oil.

LC-MS (3): t_(R)=0.83 min; [M+H]+: 273.85.

A.1.4.2. Synthesis of 2-phenyl-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxylic acid

A mixture of methyl 2-phenyl-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxylate (12.0 mg, 0.044 mmol) and LiOH.H₂O (2.7 mg, 0.065 mmol) in THF/MeOH/H₂O (1 mL, 3:1:1) was stirred at RT for 45 min. The mixture was acidified to pH=3 and extracted with DCM. The comb. org. layers were dried over MgSO₄, and conc. in vacuo.

LC-MS (3): t_(R)=0.66 min; [M+H]+: 260.13.

A.1.5. Synthesis of 2-bromo-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxylic acid A.1.5.1. Methyl 2-bromo-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxylate

At RT methyl 2-amino-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxylate (735 mg, 3.46 mmol) was added portionwise to a mixture of copper(II)bromide (1160 mg, 5.19 mmol), tert-butyl nitrite (595 mg, 5.19 mmol) and MeCN (65 mL) under an Ar-atmosphere. The mixture was stirred at RT for 20 min, then, for 15 min at 55° C. The mixture was conc. in vacuo and purified by CC (0-30% EtOAc/Hept) to provide a yellow solid.

LC-MS (3): t_(R)=0.74 min; [M+H]+: 275.98.

A.1.5.2. 2-Bromo-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxylic acid

A mixture of methyl 2-bromo-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxylate (150 mg, 0.54 mmol) and LiOH.H₂O (34 mg, 0.81 mmol) in THF/MeOH/H₂O (5 mL, 3:1:1) was stirred at RT for 90 min. The mixture was diluted with H₂O and extracted with DCM. The aq. layer was acidified to pH=3 and extracted with DCM. The comb. org. layers were washed with brine, dried over MgSO4, and conc. in vacuo.

LC-MS (3): t_(R)=0.57 min; [M+H]+: 262.03.

A.1.6. Synthesis of 5,6-dihydro-4H-cyclopenta[d]thiazole-6-carboxylic acid A.1.6.1. 2-Bromo-3-oxocyclopentanecarbonitrile

Bicyclo[2.2.1]hepta-2,5-diene (0.84 g, 9.14 mmol), followed by Gd(OTf)₃ (1.84 g, 3.05 mmol), 2-cyclopenten-1-one (5.00 g, 60.9 mmol) and TMS-CN (9.25 g, 91.4 mmol) were added to a degassed solution of Ni(cod)₂ (0.84 g, 3.04 mmol) in THF (160 mL) and the mixture was stirred at RT for 4 h. Subsequently, the mixture was quenched with solid NaHCO₃ and aq. sat. NaHCO₃ and extracted with EtOAc. The comb. org. layers were washed with brine, dried over MgSO₄ and conc. in vacuo. The residue, a yellow oil, was dissolved in THF/H₂O (450 mL, 9:1). At 0° C., NBS (11.98 g, 67.3 mmol) was added and the mixture was stirred at 0° C. for 30 min. Subsequently, the mixture was quenched with aq. sat. Na₂SO₃ and extracted with EtOAc. The comb. org. layers were washed with aq. 5% NaHCO₃ and brine, dried over Na₂SO₄, and conc. in vacuo. The residue was re-dissolved in EtOAc, washed multiple times with aq. 5% NaHCO₃ and brine, the combined org. layer were dried over Na₂SO₄, and conc. in vacuo to provide a brown liquid.

¹H-NMR (CDCl₃) δ: 4.42 (d, J=7.7 Hz, 0.5; H), 4.34 (d, J=5.8 Hz, 0.5; H), 3.43-3.40 (m, 0.5; H), 3.33-3.28 (m, 0.5; H), 2.72-2.26 (m, 4H).

A.1.6.2. 2-Amino-5,6-dihydro-4H-cyclopenta[d]thiazole-6-carbonitrile

A mixture of 2-bromo-3-oxocyclopentanecarbonitrile (crude from A.1.7.1.; ca. 13 g) and thiourea (13.77 g, 181 mmol) in dioxane (600 mL) was stirred at 80° C. for 1 h. The mixture was allowed to cool to RT, quenched with aq. sat. NaHCO₃ and extracted with EtOAc. The comb. org. layers were washed with brine, dried over MgSO₄, and conc. in vacuo. Purification by means of CC (2-20% MeOH (0.5% Et₃N)/DCM) provided a brown solid.

LC-MS (3): t_(R)=0.19 min; [M+H]+: 166.06.

A.1.6.3. 5,6-Dihydro-4H-cyclopenta[d]thiazole-6-carbonitrile

To a soln. of 2-amino-5,6-dihydro-4H-cyclopenta[d]thiazole-6-carbonitrile (1.00 g, 6.05 mmol) in THF (54 mL) was added tert-butyl nitrite (1.04 g, 9.08 mmol) and the mixture was stirred at 65° C. for 3 h. Subsequently, the mixture was quenched with aq. sat. NaHCO₃ and extracted with EtOAc. The comb. org. layers were washed with brine, dried over MgSO₄, and conc. in vacuo. Purification by means of CC (10-80% EtOAc/Hept) provided a yellow oil.

LC-MS (4): t_(R)=0.52 min; [M+H]+: 151.13.

A.1.6.4. 5,6-Dihydro-4H-cyclopenta[d]thiazole-6-carboxylic acid

A soln. of 5,6-dihydro-4H-cyclopenta[d]thiazole-6-carbonitrile (265 mg, 1.59 mmol) in aq. conc. HCl was stirred at 90° C. for 45 min in a sealed tube. The mixture was adjusted to pH=3 and extracted with EtOAc. The comb. org. layers were washed with brine, dried over MgSO₄, and conc. in vacuo to provide a yellow oil LC-MS (3): t_(R)=0.33 min; [M+H]+: 170.03.

A.1.7. Synthesis of 5,6,7,8-tetrahydro-4H-cyclohepta[d]thiazole-8-carboxylic acid A.1.7.1. 2-Amino-5,6,7,8-tetrahydro-4H-cyclohepta[d]thiazole-8-carbonitrile

Bicyclo[2.2.1]hepta-2,5-diene (0.50 g, 5.45 mmol), followed by Gd(OTf)₃ (1.10 g, 1.82 mmol), 2-cyclohepten-1-one (5.00 g, 36.3 mmol) and TMS-CN (5.51 g, 54.5 mmol) were added to a degassed solution of Ni(cod)₂ (0.50 g, 1.82 mmol) in THF (100 mL) and the mixture was stirred at RT for 4 h. Subsequently, the mixture was quenched with solid NaHCO₃ and aq. sat. NaHCO₃ and extracted with EtOAc. The comb. org. layers were washed with brine, dried over MgSO₄ and conc. in vacuo.

The residue, a yellow oil, was dissolved in THF/H₂O (200 mL, 9:1). At 0° C., NBS (5.53 g, 31.0 mmol) was added and the mixture was stirred at 0° C. for 30 min. Subsequently, the mixture was quenched with aq. sat. Na₂SO₃ and extracted with EtOAc. The comb. org. layers were washed with aq. 5% NaHCO₃ and brine, dried over Na₂SO₄, and conc. in vacuo. The residue was re-dissolved in EtOAc, washed multiple times with aq. 5% NaHCO₃ and brine, the combined org. layer were dried over Na₂SO₄, conc. in vacuo and the residue was filtrated over a plug of SiO₂ with EtOAc/Hept (1:1) as eluent.

After conc. In vacuo, the residue, a brown oil, and thiourea (6.34 g, 83.2 mmol) were dissolved in dioxane (330 mL) and the mixture was stirred at 80° C. for 2 h. Subsequently, the mixture was quenched with aq. sat. NaHCO₃ and extracted with EtOAc. The comb. org. layers were washed with brine, dried over MgSO₄, and conc. in vacuo. Purification by means of CC (2-20% MeOH/DCM) provided a brown oil.

LC-MS (3): t_(R)=0.34 min; [M+H]+: 194.21.

A.1.7.2. 5,6,7,8-Tetrahydro-4H-cyclohepta[d]thiazole-8-carbonitrile

To a soln. of 2-amino-5,6,7,8-tetrahydro-4H-cyclohepta[d]thiazole-8-carbonitrile (1.00 g, 5.17 mmol) in THF (46 mL) was added tert-butyl nitrite (0.65 g, 5.68 mmol) and the mixture was stirred at 65° C. for 2.5 h. Subsequently, the mixture was quenched with aq. sat. NaHCO₃ and extracted with EtOAc. The comb. org. layers were washed with brine, dried over MgSO₄, and conc. in vacuo. Purification by means of CC (2-40% EtOAc/Hept), CC (0-1.5% MeOH/DCM) and prep. HPLC (F) provided a yellow oil.

LC-MS (3): t_(R)=0.51 min; [M+H]+: 179.23.

A.1.7.3. 5,6,7,8-Tetrahydro-4H-cyclohepta[d]thiazole-8-carboxylic acid

A soln. of 5,6,7,8-tetrahydro-4H-cyclohepta[d]thiazole-8-carbonitrile (151 mg, 0.84 mmol) in aq. conc. HCl (2 mL) was stirred at 90° C. for 1 h in a sealed tube. The mixture was adjusted to pH=3 and extracted with EtOAc. The combined org. layers were washed with brine, dried over MgSO₄, and conc. in vacuo to provide a beige solid.

LC-MS (3): t_(R)=0.36 min; [M+H]+: 198.20.

A.1.8. Synthesis of 2-amino-5,6,7,8-tetrahydro-4H-cyclohepta[d]thiazole-8-carboxylic acid

A soln. of 2-amino-5,6,7,8-tetrahydro-4H-cyclohepta[d]thiazole-8-carbonitrile (300 mg, 1.40 mmol) in aq. conc. HCl (7 mL) was stirred at 90° C. for 1 h in a sealed tube. The mixture was adjusted to pH=3, conc. in vacuo, re-dissolved in a DMF/MeCN/H₂O mixture and filtrated. The filtrate was purified by prep. HPLC (J) to provide a yellow solid.

LC-MS (3): t_(R)=0.34 min; [M+H]+: 213.20.

A.1.9. Synthesis of 6,7-dihydro-5H-pyrano[2,3-d]thiazole-7-carboxylic acid A.1.9.1. 3-((tert-Butyldimethylsilyl)oxy)-1-(2,4-dichlorothiazol-5-yl)propan-1-01

At −20° C., a soln. of n-BuLi in hexanes (2.3 M, 10.9 mL, 25.0 mmol) was added to a soln. of DIPA (3.5 mL, 25.0 mmol) in THF (102 mL). The soln. was stirred at −20° C. for 30 min, then, it was cooled to −78° C. and a soln. of 2,4-dichlorothiazole (3.50 g, 22.7 mmol) in THF (16 mL) was added. The mixture was stirred at −78° C. for 30 min, then, 3-[(tert-butyldimethylsilyl)oxy]-1-propanal (4.51 g, 22.7 mmol) was added and the mixture was stirred at −78° C. for 1 h. Subsequently, the mixture was quenched with aq. sat. NH₄Cl and extracted with EtOAc. The comb. org. layers were washed with brine, dried over MgSO₄, and conc. in vacuo. Purification by means of CC (2-15% EtOAc/Hept) provided a yellow oil.

LC-MS (3): t_(R)=1.08 min; [M+H]+: 342.08.

A.1.9.2. 5-(3-((tert-Butyldimethylsilyl)oxy)-1-((tetrahydro-2H-pyran-2-yl)oxy)propyl)-2,4-dichlorothiazole

A soln. of 3-((tert-butyldimethylsilyl)oxy)-1-(2,4-dichlorothiazol-5-yl)propan-1-ol (6.62 g, 19.3 mmol), 3,4-dihydro-2H-pyran (8.9 mL, 96.7 mmol) and PPTS (0.49 g, 1.93 mmol) in DCM (75 mL) was stirred under reflux for 2 h. Subsequently, the volatiles were removed in vacuo and the residue was purified by means of CC (1-10% EtOAc/Hept) to provide the product as colorless oil as an isomeric mixture.

LC-MS (3): t_(R)=1.27 min; 1.28 min; [M+H]+: 426.11; 426.10.

A.1.9.3. 5-(3-((tert-Butyldimethylsilyl)oxy)-1-((tetrahydro-2H-pyran-2-yl)oxy)propyl)-4-chlorothiazole

At −78° C., a soln. of n-BuLi in hexanes (2.2 M, 9.6 mL, 21.0 mmol) was added to a soln. of 5-(3-((tert-butyldimethylsilyl)oxy)-1-((tetrahydro-2H-pyran-2-yl)oxy)propyl)-2,4-dichlorothiazole (6.89 g, 16.2 mmol) in THF (125 mL). The mixture was stirred at −78° C. for 45 min, then, quenched by the addition of aq. sat. NaHCO₃ and extracted with EtOAc. The comb. org. layers were washed with brine, dried over MgSO₄, and conc. in vacuo. Purification by means of CC (2-20% EtOAc/Hept) provided the product as a yellow oil as an isomeric mixture.

LC-MS (3): t_(R)=1.15 min; 1.16 min; [M+H]+: 392.17; 392.17.

A.1.9.4. 3-(4-Chlorothiazol-5-yl)-3-((tetrahydro-2H-pyran-2-yl)oxy)propan-1-ol

At 0° C., a soln. of TBAF in THF (1 M, 19.2 mL, 19.2 mmol) was added to a. soln. of 5-(3-((tert-butyldimethylsilyl)oxy)-1-((tetrahydro-2H-pyran-2-yl)oxy)propyl)-4-chlorothiazole (6.27 g, 16.0 mmol) in THF (80 mL). The mixture was allowed to warm to RT and stirred overnight. Then, the mixture was quenched by the addition of aq. sat. NaHCO₃ and extracted with EtOAc. The comb. org. layers were washed with brine, dried over MgSO₄, and conc. in vacuo. Purification by means of CC (20-85% EtOAc/Hept) provided the product as a yellow oil as an isomeric mixture.

LC-MS (3): t_(R)=0.55 min; 0.57 min; [M+H]+: 278.11; 278.10.

A.1.9.5. 7-((Tetrahydro-2H-pyran-2-yl)oxy)-6,7-dihydro-5H-pyrano[2,3-d]thiazole

A soln. of 3-(4-chlorothiazol-5-yl)-3-((tetrahydro-2H-pyran-2-yl)oxy)propan-1-ol (520 mg, 1.87 mmol) in MePh (10 mL) was added to a Ar-filled vial charged with Pd(OAc)₂ (63 mg, 0.28 mmol), 2-(di-tert-butylphosphino)-1,1′-binaphthyl (140 mg, 0.35 mmol) and (Cs₂CO₃ 915 mg, 2.81 mmol). The vial was sealed and placed in a preheated oilbath (100° C.) overnight. Subsequently, the mixture was diluted with DCM, filtrated over Celite, and conc. in vacuo. Purification by means of CC (20-80% EtOAc/Hept) provided the product as a yellow oil as an isomeric mixture.

LC-MS (3): t_(R)=0.60 min; 0.64 min; [M+H]+: 241.94; 241.94.

A.1.9.6. 6,7-Dihydro-5H-pyrano[2,3-d]thiazol-7-ol

A soln. of 7-((tetrahydro-2H-pyran-2-yl)oxy)-6,7-dihydro-5H-pyrano[2,3-d]thiazole (895 mg, 3.71 mmol) and PTSA (141 mg, 0.74 mmol) in THF/H₂O (7.4 mL, 1:1) was stirred at RT overnight. The mixture was diluted with DCM, dried over Na₂SO₄, and conc. in vacuo. Purification by means of CC (40-100% EtOAc/Hept) provided a yellow oil.

LC-MS (3): t_(R)=0.23 min; [M+H]+: 158.15.

A.1.9.7. 6,7-Dihydro-5H-pyrano[2,3-d]thiazole-7-carbonitrile

To a mixture of 6,7-dihydro-5H-pyrano[2,3-d]thiazol-7-ol (0.65 g, 4.14 mmol), acetone cyanohydrin (880 mg, 10.3 mmol) and (n-Bu)₃P (1.67 g, 8.27 mmol) in THF (79 mL) was added at 0° C. 1,1′-(azodicarbonyl)dipiperidine (2.09 g, 8.27 mmol). The mixture was stirred at 0° C. for 30 min, then, it was allowed to warm to RT and was stirred for 2 h. Subsequently, the reaction mixture was diluted with diisopropyl ether, filtrated and the filtrate was conc. in vacuo. Purification by means of CC (5-70% EtOAc/Hept) provided a yellow solid.

LC-MS (3): t_(R)=0.36 min; [M+H]+: 167.13.

A.1.9.8. 6,7-Dihydro-5H-pyrano[2,3-d]thiazole-7-carboxylic acid

A soln. of 6,7-dihydro-5H-pyrano[2,3-d]thiazole-7-carbonitrile (462 mg, 2.78 mmol) in aq. HCl (32%, 13.9 mL) was stirred at 60° C. for 30 min. Under ice-bath cooling, the pH of the mixture was adjusted to ca. 3, and the mixture was extracted with EtOAc. The comb. org. layers were dried over MgSO₄ and conc. in vacuo to provide a beige solid.

LC-MS (3): t_(R)=0.33 min; [M+H]+: 186.18.

A.1.10. Synthesis of 5,6-dihydrofuro[2,3-d]thiazole-6-carboxylic acid A.1.10.1. 4-((2,2-Dimethyl-1,3-dioxolan-4-yl)methoxy)thiazole

NaH (60% dispersion in mineral oil, 12.19 g, 305.3 mmol) was added portionwise to DL-1,2-isoproylideneglycerol (16.11 g, 1218 mmol) and the mixture was stirred until gas evolution had ceased (ca. 30 min RT, followed by 2 h at 60° C.). Subsequently, 4-bromothiazole (20.00 g, 121.9 mmol) was added and the mixture was stirred at 140° C. for 45 min. Subsequently, the reaction mixture was quenched with aq. sat. NH₄Cl and extracted with EtOAc. The comb. org. layers were washed with brine, dried over MgSO₄, and conc. in vacuo. The residue was subjected to distillation and the volatiles (HV, 60° C.) were removed. The residue was purified by means of CC (5-40% EtOAc/Hept) to provide a yellow oil.

LC-MS (3): t_(R)=0.52 min; [M+H]+: 216.20.

A.1.10.2. 5-Bromo-4-((2,2-dimethyl-1,3-dioxolan-4-yl)methoxy)thiazole

At 0° C., NBS (11.94 g, 67.1 mmol) was added over 90 min to a soln. of 4-((2,2-dimethyl-1,3-dioxolan-4-yl)methoxy)thiazole (13.75 g, 63.9 mmol) in MeCN (320 mL). The mixture was further stirred at 0° C. for 30 min, then, it was quenched by the addition of aq. 5% NaHCO₃ and extracted with EtOAc. The comb. org. layers were washed with aq. 5% NaHCO₃ and brine, dried over MgSO₄, and conc. in vacuo.

LC-MS (3): t_(R)=0.74 min; [M+H]+: 294.13.

A.1.10.3. 5-Bromo-4-(oxiran-2-ylmethoxy)thiazole

A soln. of 5-bromo-4-((2,2-dimethyl-1,3-dioxolan-4-yl)methoxy)thiazole (18.80 g, 63.9 mmol) and PPTS (0.80 g, 3.19 mmol) in MeOH (256 mL) was stirred under reflux for 3 h. More PPTS (0.40 g, 1.60 mmol) was added and the mixture was stirred under reflux for additional 2 h. The mixture was conc. in vacuo, the residue was dissolved in MeOH (256 mL) and stirred under reflux for 2 h. The mixture was conc. in vacuo, the residue was dissolved in DCM (256 mL) and treated with trimethyl orthoformate (10.5 mL, 95.8 mmol). The mixture was stirred overnight at RT. Subsequently, additional trimethyl orthoformate (3.5 mL, 31.9 mmol) was added and the mixture was stirred at RT for 1 h. Then, the mixture was conc. in vacuo, the residue was dissolved in DCM (256 mL), treated with AcBr (5.73 mL, 76.7 mmol) and stirred at RT for 90 min. Subsequently, the mixture was conc. in vacuo, the residue was dissolved in MeOH (320 mL) and K₂CO₃ (17.66 g, 128 mmol) was added to the mixture. After the mixture was stirred at RT for 90 min, the mixture was filtrated and the filtrate was poured into cold aq. sat. NH₄Cl. The mixture was extracted with EtOAc, the comb. org. layers were washed with brine, dried over MgSO₄, and conc. in vacuo. The residue was purified by means of CC (2-40% EtOAc/Hept) to provide a yellow oil.

LC-MS (3): t_(R)=0.60 min; [M+H]+: 236.06.

A.1.10.4. (2-(Triisopropylsilyl)-5,6-dihydrofuro[2,3-d]thiazol-6-yl)methanol

At −78° C., a soln. of n-BuLi in hexanes (2.18 M, 16.7 mL, 36.4 mmol) was added over 30 min to a soln. of 5-bromo-4-(oxiran-2-ylmethoxy)thiazole (7.17 g, 30.4 mmol) in THF (564 mL). The mixture was stirred at −78° C. for 2 h, then, TIPSCl (6.63 mL, 31.0 mmol) was added, the mixture was allowed to warm to RT and stirred at RT for 30 min. Subsequently, the mixture was cooled to −78° C. and treated with a soln. of n-BuLi in hexanes (2.18 M, 13.9 mL, 30.4 mmol). The mixture was stirred at 0° C. for 2 h, then, it was quenched with aq. sat. NaHCO₃ and extracted with EtOAc. The comb. org. layers were washed with brine, dried over MgSO₄, and conc. in vacuo. The residue was purified by means of CC (100 g KP-Sil, EtOAc/Hept 5-50%), followed by CC (5-50% EtOAc/Hept) to provide a yellow oil.

LC-MS (3): t_(R)=1.01 min; [M+H]+: 314.13.

A.1.10.5. 2-(Triisopropylsilyl)-5,6-dihydrofuro[2,3-d]thiazole-6-carboxylic acid

A soln. of (2-(triisopropylsilyl)-5,6-dihydrofuro[2,3-d]thiazol-6-yl)methanol (1.77 g, 5.64 mmol)) in DCM (56 mL) was treated at 0° C. with DMP (2.87 g, 6.77 mmol) portionwise over 1 h. The mixture was stirred at 0° C. for 2 h, then, it was allowed to warm to RT and stirred for 2 h. Subsequently, the mixture was quenched with aq. sat. Na₂S₂O₃ and aq. sat. NaHCO₃ and was extracted with DCM. The comb. org. layers were washed with brine, dried over MgSO₄, and conc. in vacuo. The residue was dissolved in tert-BuOH (16 mL) and 2-methyl-2-butene (4 mL) and treated at 0° C. dropwise over 30 min with a soln. of NaH₂PO₄ (2.64 g, 16.9 mmol) and NaClO₂ (0.96 g, 8.46 mmol) in H₂O (5 mL). The mixture was stirred at RT for 45 min, then, the volatiles were removed in vacuo, the residue was diluted with H₂O and extracted with EtOAc. The comb. org. layers were dried over MgSO₄ and conc. in vacuo.

LC-MS (3): t_(R)=0.99 min; [M+H]+: 328.24.

A.1.10.6. 5,6-Dihydrofuro[2,3-d]thiazole-6-carboxylic acid

A soln. of TBAF in THF (1 M, 4.9 mL, 4.90 mmol) was added at 0° C. to soln. of 2-(triisopropylsilyl)-5,6-dihydrofuro[2,3-d]thiazole-6-carboxylic acid (1.62 mg, 4.90 mmol) in THF (25 mL). The mixture was stirred at 0° C. for 30 min, AcOH (0.42 mL, 7.35 mmol) was added, and the volatiles were removed in vacuo. The residue was purified by means of prep. HPLC (I) to provide a colorless solid.

LC-MS (3): t_(R)=0.30 min; [M+H]+: 172.05.

A.2. Synthesis of amines (III) A.2.1. Synthesis of 2,4-dichloro-6-cyclopropylbenzylamine

A.2.1.1. Synthesis of 2-(2-bromo-4,6-dichlorobenzyl)isoindoline-1,3-dione To a soln. of 1-bromo-2-(bromomethyl)-3,5-dichlorobenzene (1.98 mmol) [J. Med. Chem. 1992, 35, 4221-4229] in 10 mL CH₃CN were added phthalimide (1.98 mmol) and K₂CO₃ (5.93 mmol). The reaction mixture was stirred at 50° C. for 6 h and then at RT overnight. Sat. aq. NaHCO₃ soln. was added and the mixture was extracted 3 times with DCM. The comb. org. phases were dried over MgSO₄ and conc. in vacuo to obtain the desired product as beige solid.

LC-MS (3): t_(R)=0.99 min; ¹H NMR (CDCl₃) δ: 7.91-7.71 (m, 4H), 7.57 (s, 1H), 7.41 (s, 1H), 5.13 (s, 2H).

A.2.1.2. Synthesis of 2,4-dichloro-6-cyclopropylbenzylamine

To a soln. of 2-(2-bromo-4,6-dichlorobenzyl)isoindoline-1,3-dione (1.96 mmol) in 16 mL toluene and 0.8 mL water were added K₃PO₄ (6.85 mmol), PPh₃ (0.23 mmol), cyclopropylboronic acid (2.35 mmol) and Pd(OAc)₂ (0.15 mmol). The mixture was stirred at 80° C. for 24 h when another portion of cyclopropylboronic acid (1.96 mmol) and Pd(OAc)₂ (0.15 mmol) were added. The reaction mixture was stirred at 80° C. for further 4 days, cooled to RT, quenched with sat. aq. NaHCO₃ solution and extracted with EtOAc. The comb. org. layers were dried over MgSO₄ and conc. in vacuo to give a crude white solid. This solid was dissolved in 15 mL EtOH and 12.6 mL of hydrazine monohydrate was added. After stirring at RT for 30 min, EtOAc was added. The aq. phase was basified with 1M NaOH soln. and extracted 3 times with EtOAc. The comb. org. layers were dried over MgSO₄ and conc. Purification with CC (KP-NH™ from Biotage) gives the desired compound as red/brown oil.

LC-MS (3): t_(R)=0.60 min; [M+H]+: 216.15.

A.2.2. Synthesis of (2-(aminomethyl)-3,5-dichlorophenyl)methanol A.2.2.1. Synthesis of 2-(bromomethyl)-4,6-dichlorobenzonitrile

A soln. of 2,4-dichloro-6-methylbenzonitrile (16.9 mmol) in 34 mL chlorobenzene was heated to 50° C. when NBS (18.6 mmol) was added. The flask was purged with Ar before AIBN (1.69 mmol) was added at once still at 50° C. The reaction mixture was then stirred at 78° C. After 2 h and 4 h, another portion of AIBN (1.69 mmol) was added and heating to 78° C. was continued overnight. The solvent was then evaporated off, the resulting residue was redissolved in Et₂O and the remaining solid was removed by filtration. The filtrate was washed twice with 2N HCl solution and brine, it was dried over MgSO₄ and conc. in vacuo. Purification with CC (0-100% EtOAc/Hept) gives the desired compound as yellowish solid.

LC-MS (3): t_(R)=0.88 min; ¹H NMR ((CD₃)₂SO) δ: 8.02 (s, 1H), 7.92 (s, 1H), 4.79 (s, 2H).

A.2.2.2. Synthesis of 3,5-dichloro-2-cyanobenzyl acetate

To a soln. of 2-(bromomethyl)-4,6-dichlorobenzonitrile (15.1 mmol) in 30 mL AcOH was added NaOAc (75.7 mmol). The suspension was heated to 100° C. for 2 h. The solvent was evaporated off and the residue partitioned between DCM and water. The org. phase was washed with water, dried over MgSO₄ and conc. in vacuo. Purification with CC (5-70% EtOAc/Hept) gives the desired compound as white solid.

LC-MS (5): t_(R)=0.88 min; ¹H NMR ((CD₃)₂SO) δ: 8.02 (s, 1H), 7.76 (s, 1H), 5.23 (s, 2H), 2.12 (s, 3H).

A.2.2.3. Synthesis of (2-(aminomethyl)-3,5-dichlorophenyl)methanol

To a soln. of 3,5-dichloro-2-cyanobenzyl acetate (11.7 mmol) in 50 mL THF was added a soln. of BH₃ (50 mmol, 1M in THF). The reaction mixture was heated to 75° C. for 7 h and then cooled to 0° C. Water was added followed by MeOH and the mixture was conc. The residue was taken up in water and EtOAc, acidified with 1N HCl solution and extracted with DCM. The aq. phase was then basified with 1M NaOH soln. and extracted with DCM. The comb. org. layers were dried over MgSO₄ and conc. in vacuo. Purification with CC (0-10% MeOH/DCM; 1% Et₃N) gives the desired compound as pinkish solid.

LC-MS (5): t_(R)=0.42 min; ¹H NMR ((CD₃)₂SO) δ: 7.46 (s, 1H), 7.38 (s, 1H), 4.60 (s, 2H), 3.76 (s, 2H).

A.2.3. Synthesis of 2,4-dichloro-6-methoxybenzylamine A.2.3.1. Synthesis of 2,4-dichloro-6-methoxybenzaldehyde

To a soln. of 4,6-dichlorosalicylaldehyde (2.69 mmol) in 5 mL DMF was added K₂CO₃ (5.39 mmol) followed by iodomethane (2.96 mmol). The reaction mixture was heated to 50° C. for 3.5 h. At RT, the mixture was diluted with EtOAc and washed 3 times with water and then with brine. The comb. org. layers were dried over MgSO₄ and conc. in vacuo to give the desired product as beige solid.

LC-MS (3): t_(R)=0.78 min; ¹H NMR ((CD₃)₂SO) δ: 10.30 (s, 1H), 7.36 (s, 1H), 7.32 (s, 1H), 3.39 (s, 3H).

A.2.3.2. Synthesis of 2,4-dichloro-6-methoxybenzaldehyde oxime

A sol. of 2,4-dichloro-6-methoxybenzaldehyde (2.39 mmol) in 5 mL DMF was cooled to 0° C. and NaOAc (2.63 mmol) followed by hydroxylamine HCl (2.63 mmol) were added. The ice bath was removed and the reaction mixture was stirred at RT for 10 min. The mixture was diluted with EtOAc and washed once with water and brine. The comb. org. layers were dried over MgSO₄ and conc. in vacuo to give the desired compound as white solid.

LC-MS (3): t_(R)=0.73 min; [M+H]+: 220.14.

A.2.3.3. Synthesis of 2,4-dichloro-6-methoxybenzylamine

A suspension of 2,4-dichloro-6-methoxybenzaldehyde oxime (2.24 mmol) in 3 mL AcOH was cooled to 0° C. and zinc dust (8.53 mmol) was added. The reaction mixture was stirred at RT for 2 h. It was filtered over a pad of celite and washed with EtOAc and MeOH. The filtrate was conc. and redissolved in water (pH 4 with 2N HCl solution). It was washed once with EtOAc, the ageous phase was basified with 1M NaOH solution, extracted 3 times with EtOAc and DCM. The comb. org. layers were dried over MgSO₄ and conc. in vacuo to give the desired product as yellow solid.

LC-MS (3): t_(R)=0.47 min; [M+CH₃CN+H]+: 246.99.

A.2.4. Synthesis of 2-(2-(aminomethyl)-3,5-dichlorophenoxy)ethanol A.2.4.1. Synthesis of 2-(3,5-dichloro-2-formylphenoxy)ethyl acetate

To a soln. of 4,6-dichlorosalicylaldehyde (3.72 mmol) in 5 mL DMF was added Cs₂CO₃ (3.72 mmol) followed by KI (3.72 mmol) and 2-bromoethylacetate (8.68 mmol). The reaction mixture was heated to 100° C. for 4 h and then stirred at RT for 3 days. The mixture was diluted with EtOAc and washed 3 times with water and then with brine. The comb. org. layers were dried over MgSO₄ and conc. in vacuo. Purification with CC (20-100% EtOAc/Hept) gives the desired compound as beige solid.

LC-MS (5): t_(R)=0.86 min; [M+H]+: 227.12.

A.2.4.2. Synthesis of 2-(3,5-dichloro-2-((hydroxyimino)methyl)phenoxy)ethyl acetate

A soln. of 2-(3,5-dichloro-2-formylphenoxy)ethyl acetate (1.48 mmol) in 2.5 mL DMF was cooled to 0° C. and NaOAc (1.62 mmol) followed by hydroxylamine HCl (1.62 mmol) were added. The ice bath was removed and the reaction mixture was stirred at RT for 1.5 h. The mixture was diluted with EtOAc and washed once with water and brine. The comb. org. layers were dried over MgSO₄ and conc. in vacuo. Purification with CC using Hept and EtOAc gives the desired compound as white solid.

LC-MS (5): t_(R)=0.81 min; [M+H]+: 292.25.

A.2.4.3. Synthesis of 2-(2-(aminomethyl)-3,5-dichlorophenoxy)ethanol

A suspension of 2-(3,5-dichloro-2-((hydroxyimino)methyl)phenoxy)ethyl acetate (1.15 mmol) in 2 mL AcOH was cooled to 0° C. and zinc dust (4.36 mmol) was added. The reaction mixture was stirred at RT for 1 h. It was filtered over a pad of celite and washed with EtOAc and MeOH. The filtrate was conc. and redissolved in water (pH 4 with 2N HCl solution). It was washed once with EtOAc, the ageous phase was basified with 1M NaOH solution, extracted 3 times with EtOAc and DCM. The comb. org. layers were dried over MgSO₄ and concentrated in vacuo to give the desired product as white solid.

LC-MS (5): t_(R)=0.46 min; [M+H]+: 236.01.

A.2.5. Synthesis of 2-chloro-3-cyanobenzylamine A.2.5.1. Synthesis of 3-(bromomethyl)-2-chlorobenzonitrile

A soln. of 2-chloro-3-methylbenzonitrile (6.6 mmol) in 25 mL chlorobenzene was heated to 50° C. when NBS (7.9 mmol) was added. The flask was purged with Ar before AIBN (0.66 mmol) was added at once still at 50° C. The reaction mixture was stirred at 80° C. for 2 h. The solvent was evaporated off, the resulting residue was redissolved in Et₂O and washed 3 times with 1N HCl soln. and brine. It was dried over MgSO₄ and conc. in vacuo. Purification with CC (0-15% EtOAc/Hept) gives the desired compound as white solid.

LC-MS (3): t_(R)=0.78 min; ¹H NMR ((CD₃)₂SO) δ: 7.98 (m, 2H), 7.58 (t, 1H), 4.80 (s, 2H).

A.2.5.2. Synthesis of 2-chloro-3-cyanobenzylamine

To a soln. of 3-(bromomethyl)-2-chlorobenzonitrile (0.87 mmol) in 9 mL DMF was added NaN₃ (1.3 mmol) and the resulting brown solution was stirred at RT for 20 min. The reaction mixture was diluted with EtOAc, washed twice with water and brine, dried over MgSO₄ and concentrated in vacuo. The crude azide was redissolved in 4.3 mL THF and 0.1 mL water. Triphenylphosphine (1.04 mmol) was added and the mixture was stirred at RT overnight. The reaction mixture was acidified with 0.1; N HCl soln. until pH 3 and it was extracted 3 times with Et₂O. The aq. phase was basified with 1M NaOH soln. and extracted 3 times with DCM. The comb. org. layers were dried over MgSO₄ and conc. in vacuo to give the desired product as yellowish oil.

LC-MS (3): t_(R)=0.31 min; [M+CH₃CN+H]+: 208.04.

A.2.6. Synthesis of 2,4-dichloro-6-methoxymethylbenzylamine A.2.6.1. Synthesis of 2,4-dichloro-6-(methoxymethyl)benzonitrile

To a suspension of 2-(bromomethyl)-4,6-dichlorobenzonitrile (1.04 mmol) (A.2.2.1.) in 2.5 mL MeOH was added a solution of NaOMe (1.27 mmol, 0.5M in MeOH). The reaction mixture was heated to 50° C. for 1 h. The mixture was conc. in vacuo, redissolved in EtOAc and it was then washed twice with an aq. soln. of KHSO₄, twice with a sat. aq. NaHCO₃ soln. and once with brine. The org. layer was dried over MgSO₄ and conc. in vacuo to give the desired product as orange oil.

LC-MS (3): t_(R)=0.84 min; ¹H NMR ((CD₃)₂SO) δ: 7.97 (s, 1H), 7.67 (s, 1H), 4.59 (s, 2H), 3.37 (s, 3H).

A.2.6.2. Synthesis of 2,4-dichloro-6-methoxymethylbenzylamine

A soln. of BH₃ (3.5 mL, 1M in THF) was added to a solution of 2,4-dichloro-6-(methoxymethyl)benzonitrile (0.88 mmol) in 3 mL THF. The reaction mixture was heated to 60° C. for 2 h. At 0° C., 3.5 mL MeOH was dropwise added and the mixture was stirred until gaz evolution was finished. An aq. soln. of 10% NaOH was added still under cooling. The solvent was removed under vacuo, the residue was diluted with water and extracted 3 times with EtOAc. The comb. org. layers were dried over MgSO₄ and conc. in vacuo to give the desired product as orange oil.

LC-MS (3): t_(R)=0.45 min; [M+H]+: 220.26.

A.2.7. Synthesis of 2-trifluoromethyl-3-chlorobenzylamine

This compound was prepared using a method analogous to that of 2-chloro-3-cyanobenzylamine (A.2.5.), 1-chloro-3-methyl-2-(trifluoromethyl)benzene replacing 2-chloro-3-methylbenzonitrile.

LC-MS (3): t_(R)=0.44 min; [M+CH₃CN+H]+: 250.99.

A.2.8. Synthesis of 5,7-dichloro-2,3-dihydro-1H-inden-1-amine A.2.8.1. Synthesis of 5,7-dichloro-2,3-dihydro-1H-inden-1-one O-methyl oxime

To a soln. of 5,7-dichloro-1-indanone (0.34 mmol) in 2 mL MeOH was added O-methylhydroxylamine HCl (0.34 mmol). The reaction mixture was stirred at RT for 17 h and then heated to 50° C. for 24 h. The mixture was cooled to RT, diluted with water and extracted 3 times with EtOAc. The comb. org. layers were dried over MgSO₄ and conc. in vacuo to give the desired product as white solid.

LC-MS (3): t_(R)=0.99 min; [M+H]+: 229.96.

A.2.8.2. Synthesis of 5,7-dichloro-2,3-dihydro-1H-inden-1-amine

A soln. of BH₃ (0.6 mL, 1M in THF) was added to a soln. of 5,7-dichloro-2,3-dihydro-1H-inden-1-one O-methyl oxime (0.31 mmol) in 1 mL THF. The reaction mixture was heated to 60° C. for 3 days. An aq. 1M NaOH soln was added and heating to 60° C. was continued for another 24 h. The solvent was removed under vacuo, the residue was diluted with a sat. aq. NaHCO₃ soln. and extracted 3 times with EtOAc. The comb. org. layers were dried over MgSO₄ and conc. in vacuo to give the desired product as colorless oil.

LC-MS (3): t_(R)=0.46 min; [M+H]+: 202.03.

A.2.8.3. Chiral separation of 5,7-dichloro-2,3-dihydro-1H-inden-1-amine

rac 5,7-Dichloro-2,3-dihydro-1H-inden-1-amine was separated into the respective enantiomers using prep. chiral HPLC (Daicel, ChiralPak AY-H, 5 μm, 20×250 mm; Hept/EtOH 90/10 0.1% DEA, flow 16 mL/min), detection: UV 210 nm Chiral analytic HPLC (Daicel, ChiralPak AY-H, 5 μm, 250×4.6 mm, Hept 0.05% DEA/EtOH 0.05% DEA 90/10, flow 0.8 mL/min), detection: UV 210 nm

Enantiomer A: t_(R)=7.57 min;

Enantiomer B: t_(R)=8.59 min.

A.2.9. Synthesis of 2-bromo-4,6-dichlorobenzylamine

This compound was prepared using a method analogous to that of 2-chloro-3-cyanobenzylamine (A.2.5.), 1-bromo-2-(bromomethyl)-3,5-dichlorobenzene [J. Med. Chem. 1992, 35, 4221] replacing 3-(bromomethyl)-2-chlorobenzonitrile.

LC-MS (3): t_(R)=0.45 min; [M+CH₃CN+H]+: 294.83.

A.2.10. Synthesis of 2-((2-(aminomethyl)-3,5-dichlorobenzyl)oxy)ethanol A.2.10.1. Synthesis of 2-((3,5-dichloro-2-cyanobenzyl)oxy)ethyl acetate

To a soln. of 2-(bromomethyl)-4,6-dichlorobenzonitrile (1.3 mmol) (A.2.2.1.) and 2-hydroxyethyl acetate (1.43 mmol) in 7 mL THF was added NaH (1.95 mmol, 60% suspension in oil). The reaction mixture was stirred at RT overnight and then poured into a 1M HCl soln. The mixture was extracted twice with EtOAc. The comb. org. layers were washed with brine, dried over MgSO₄ and conc. in vacuo. Purification with CC (0-25% EtOAc/Hept) gives the desired compound as orange oil.

LC-MS (3): t_(R)=0.82 min; [M+H]+: 287.89.

A.2.10.2 Synthesis of 2-((2-(aminomethyl)-3,5-dichlorobenzyl)oxy)ethanol

A soln. of BH₃ (1.46 mL, 1M in THF) was added to a soln. of 2-((3,5-dichloro-2-cyanobenzyl)oxy)ethyl acetate (0.36 mmol) in 1.5 mL MeOH. The reaction mixture was heated to 60° C. for 3 h. At 0° C., 1.5 mL MeOH was dropwise added and the mixture was stirred until gaz evolution was finished. An aq. soln. of 10% NaOH was added still under cooling. The solvent was removed under vacuo, the residue was diluted with water and extracted 3 times with EtOAc. The comb. org. layers were dried over MgSO₄ and conc. in vacuo to give the desired product as yellow solid.

LC-MS (3): t_(R)=0.43 min; [M+H]+: 250.20.

B. Preparation of Examples B.1. Synthesis of compounds of formula (I) (general procedure)

A mixture of the respective carboxylic acid (II) (0.30 mmol), the respective amine (III) (0.36 mmol), HOBt (0.45 mmol), EDC.HCl (0.45 mmol) and DIPEA (0.90 mmol) in DMF (1.2 mL) was stirred at RT overnight. The mixture was filtrated and the filtrate was purified by purification methods listed beforehand to give the desired amides (I).

For the syntheses of N-(5,7-dichloro-2,3-dihydro-1H-inden-1-yl)-5,6-dihydrofuro[2,3-d]thiazole-6-carboxamide (example 11), N-(5,7-dichloro-2,3-dihydro-1H-inden-1-yl)-5,6-dihydro-4H-cyclopenta[d]thiazole-6-carboxamide (example 27) and N-(5,7-dichloro-2,3-dihydro-1H-inden-1-yl)-6,7-dihydro-5H-pyrano[2,3-d]thiazole-7-carboxamide (example 41) enantiomer B of 5,7-dichloro-2,3-dihydro-1H-inden-1-amine which was obtained by chiral separation as described in A.2.8.3. was used as amine of formula (III).

B.2. Synthesis of N-(2,4-dichloro-6-methylbenzyl)-2-(trifluoromethyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide (Example 58)

To a degassed solution of 2-bromo-N-(2,4-dichloro-6-methylbenzyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide (12 mg, 0.0276 mmol) (example 61) in DMF (0.5 mL) were sequentially added copper(I)iodide (26 mg, 0.1380 mmol), triphenylarsine (3.4 mg, 0.0111 mmol), tris(dibenzylideneacetone)dipalladium(0)chloroform adduct (1.4 mg, 0.0014 mmol) and methyl 2,2-difluoro-2-(fluorosulfonyl)acetate (26 mg, 0.1380 mmol). The resulting suspension was stirred at 100° C. for 4.5 h. The mixture was filtrated and the filtrate purified by prep. HPLC (F).

LC-MS (3): t_(R)=0.97 min; [M+H]+: 422.97.

EXAMPLE LIST

LC-MS Purification LC- t_(R) Compound Name method MS [min] [M + H]⁺ Example 1 N-(4-chlorobenzyl)-5,6- A 1 0.88 294.9 dihydrofuro[2,3-d]thiazole-6- carboxamide Example 2 N-(2,4-dichlorobenzyl)-5,6- E 3 0.70 329.0 dihydrofuro[2,3-d]thiazole-6- carboxamide Example 3 N-(2-chloro-4-fluorobenzyl)-5,6- A 1 0.89 312.9 dihydrofuro[2,3-d]thiazole-6- carboxamide Example 4 N-(3,4-dichlorobenzyl)-5,6- A 1 1.01 328.9 dihydrofuro[2,3-d]thiazole-6- carboxamide Example 5 N-(2-bromo-4,6-dichlorobenzyl)-5,6- B 1 1.12 406.5 dihydrofuro[2,3-d]thiazole-6- carboxamide Example 6 N-(2,4-dichloro-6-methylbenzyl)-5,6- F 3 0.75 343.0 dihydrofuro[2,3-d]thiazole-6- carboxamide Example 7 N-(2,4-dichlorophenethyl)-5,6- A 1 1.07 342.6 dihydrofuro[2,3-d]thiazole-6- carboxamide Example 8 N-(3-(2,4-dichlorophenyl)propyl)-5,6- B 1 1.18 356.9 dihydrofuro[2,3-d]thiazole-6- carboxamide Example 9 N-((S)-1-(2,4-dichlorophenyl)-2- A 1 0.84 358.7 hydroxyethyl)-5,6-dihydrofuro[2,3- d]thiazole-6-carboxamide (mixture of epimers) Example 10 N-(2,4-dichloro-6- A 1 0.86 358.7 (hydroxymethyl)benzyl)-5,6- dihydrofuro[2,3-d]thiazole-6- carboxamide Example 11 N-(5,7-dichloro-2,3-dihydro-1H-inden- B 1 1.09 354.9 1-yl)-5,6-dihydrofuro[2,3-d]thiazole-6- carboxamide (mixture of epimers) Example 12 N-(2,4-dichloro-6-cyclopropylbenzyl)- B 1 1.23 368.9 5,6-dihydrofuro[2,3-d]thiazole-6- carboxamide Example 13 N-(2-chloro-3-(trifluoromethyl)benzyl)- A 1 1.06 362.9 5,6-dihydrofuro[2,3-d]thiazole-6- carboxamide Example 14 N-(3-chloro-2-(trifluoromethyl)benzyl)- A 1 1.05 362.9 5,6-dihydrofuro[2,3-d]thiazole-6- carboxamide Example 15 N-(2,4-dichloro-6-((2- A 1 0.90 402.9 hydroxyethoxy)methyl)benzyl)-5,6- dihydrofuro[2,3-d]thiazole-6- carboxamide Example 16 N-(4-phenoxybenzyl)-5,6- B 1 1.11 353.0 dihydrofuro[2,3-d]thiazole-6- carboxamide Example 17 N-(2,4-dichlorobenzyl)-5,6-dihydro- F 3 0.70 327.0 4H-cyclopenta[d]thiazole-6- carboxamide Example 18 N-(2-chloro-4-fluorobenzyl)-5,6- A 1 0.91 311.0 dihydro-4H-cyclopenta[d]thiazole-6- carboxamide Example 19 N-(2-bromo-4,6-dichlorobenzyl)-5,6- B 1 1.14 404.8 dihydro-4H-cyclopenta[d]thiazole-6- carboxamide Example 20 N-(2,4-dichloro-6-methylbenzyl)-5,6- F 3 0.74 341.0 dihydro-4H-cyclopenta[d]thiazole-6- carboxamide Example 21 N-(2,4-dichlorophenethyl)-5,6- B 1 1.08 341.1 dihydro-4H-cyclopenta[d]thiazole-6- carboxamide Example 22 N-(2-chloro-3-cyanobenzyl)-5,6- A 1 0.78 318.1 dihydro-4H-cyclopenta[d]thiazole-6- carboxamide Example 23 N-(3-(2,4-dichlorophenyl)propyl)-5,6- B 1 1.19 354.9 dihydro-4H-cyclopenta[d]thiazole-6- carboxamide Example 24 N-((S)-1-(2,4-dichlorophenyl)-2- A 1 0.85 357.1 hydroxyethyl)-5,6-dihydro-4H- cyclopenta[d]thiazole-6-carboxamide (mixture of epimers) Example 25 N-(2,4-dichloro-6- A 1 0.88 357.1 (hydroxymethyl)benzyl)-5,6-dihydro- 4H-cyclopenta[d]thiazole-6- carboxamide Example 26 N-(2,4-dichloro-6-methoxybenzyl)- A 1 1.07 357.1 5,6-dihydro-4H-cyclopenta[d]thiazole- 6-carboxamide Example 27 N-(5,7-dichloro-2,3-dihydro-1H-inden- B 1 1.11 353.1 1-yl)-5,6-dihydro-4H- cyclopenta[d]thiazole-6-carboxamide (mixture of epimers) Example 28 N-(2-chloro-3-(trifluoromethyl)benzyl)- F 3 0.71 361.0 5,6-dihydro-4H-cyclopenta[d]thiazole- 6-carboxamide Example 29 N-(3-fluoro-4- A 1 1.07 361.1 (trifluoromethoxy)benzyl)-5,6-dihydro- 4H-cyclopenta[d]thiazole-6- carboxamide Example 30 N-(4-chlorobenzyl)-N-methyl-6,7- A 1 0.99 323.0 dihydro-5H-pyrano[2,3-d]thiazole-7- carboxamide Example 31 N-(2,4-dichlorobenzyl)-6,7-dihydro- E 3 0.70 343.0 5H-pyrano[2,3-d]thiazole-7- carboxamide Example 32 N-(2-chloro-4-fluorobenzyl)-6,7- A 1 0.89 326.7 dihydro-5H-pyrano[2,3-d]thiazole-7- carboxamide Example 33 N-(2,3-dichlorobenzyl)-6,7-dihydro- A 1 0.98 342.7 5H-pyrano[2,3-d]thiazole-7- carboxamide Example 34 N-(2,4-dichloro-6-methylbenzyl)-6,7- F 3 0.74 357.0 dihydro-5H-pyrano[2,3-d]thiazole-7- carboxamide Example 35 N-(2,4-dichlorophenethyl)-6,7- B 1 1.07 356.9 dihydro-5H-pyrano[2,3-d]thiazole-7- carboxamide Example 36 N-(2-chloro-3-cyanobenzyl)-6,7- A 1 0.77 333.9 dihydro-5H-pyrano[2,3-d]thiazole-7- carboxamide Example 37 N-(4-(trifluoromethyl)benzyl)-6,7- A 1 0.98 342.8 dihydro-5H-pyrano[2,3-d]thiazole-7- carboxamide Example 38 N-(3-(2,4-dichlorophenyl)propyl)-6,7- B 1 1.17 370.9 dihydro-5H-pyrano[2,3-d]thiazole-7- carboxamide Example 39 N-((S)-1-(2,4-dichlorophenyl)-2- A 1 0.85 372.9 hydroxyethyl)-6,7-dihydro-5H- pyrano[2,3-d]thiazole-7-carboxamide (mixture of epimers) Example 40 N-(2,4-dichloro-6- A 1 0.86 372.9 (hydroxymethyl)benzyl)-6,7-dihydro- 5H-pyrano[2,3-d]thiazole-7- carboxamide Example 41 N-(5,7-dichloro-2,3-dihydro-1H-inden- B 1 1.10 368.9 1-yl)-6,7-dihydro-5H-pyrano[2,3- d]thiazole-7-carboxamide (mixture of epimers) Example 42 N-(2-chloro-3-(trifluoromethyl)benzyl)- A 1 1.05 376.9 6,7-dihydro-5H-pyrano[2,3-d]thiazole- 7-carboxamide Example 43 N-(2,4-dichloro-6-(2- A 1 0.94 402.9 hydroxyethoxy)benzyl)-6,7-dihydro- 5H-pyrano[2,3-d]thiazole-7- carboxamide Example 44 N-(3-fluoro-4- A 1 1.06 376.9 (trifluoromethoxy)benzyl)-6,7-dihydro- 5H-pyrano[2,3-d]thiazole-7- carboxamide Example 45 N-(4-phenoxybenzyl)-6,7-dihydro-5H- B 1 1.11 367.0 pyrano[2,3-d]thiazole-7-carboxamide Example 46 N-(4-chlorobenzyl)-4,5,6,7- C 2 0.94 307.0 tetrahydrobenzo[d]thiazole-7- carboxamide Example 47 N-(4-chlorobenzyl)-N-methyl-4,5,6,7- C 2 1.07 321.0 tetrahydrobenzo[d]thiazole-7- carboxamide Example 48 N-(3-chloro-2-methylbenzyl)-4,5,6,7- C 2 1.03 321.0 tetrahydrobenzo[d]thiazole-7- carboxamide Example 49 2-amino-N-(2,4-dichlorobenzyl)- H 3 0.58 356.0 4,5,6,7-tetrahydrobenzo[d]thiazole-7- carboxamide Example 50 N-(2,4-dichlorobenzyl)-2-methyl- F 3 0.66 355.0 4,5,6,7-tetrahydrobenzo[d]thiazole-7- carboxamide Example 51 2-bromo-N-(2,4-dichlorobenzyl)- F 3 0.86 418.9 4,5,6,7-tetrahydrobenzo[d]thiazole-7- carboxamide Example 52 N-(2,4-dichlorobenzyl)-4,5,6,7- F, H 3 0.69 340.9 tetrahydrobenzo[d]thiazole-7- carboxamide Example 53 N-(2-chloro-4-fluorobenzyl)-4,5,6,7- C 2 0.97 325.0 tetrahydrobenzo[d]thiazole-7- carboxamide Example 54 N-(2,3-dichlorobenzyl)-4,5,6,7- C 2 1.04 341.0 tetrahydrobenzo[d]thiazole-7- carboxamide Example 55 N-(2,3-dihydro-1H-inden-1-yl)-4,5,6,7- C 2 0.93 299.1 tetrahydrobenzo[d]thiazole-7- carboxamide (mixture of 4 stereoisomers) Example 56 N-((R)-1-(2,4-dichlorophenyl)ethyl)- D 2 1.15 355.0 4,5,6,7-tetrahydrobenzo[d]thiazole-7- carboxamide (mixture of epimers) Example 57 N-(2,4-dichloro-6-methylbenzyl)-2- F, H 3 0.95 430.9 phenyl-4,5,6,7- tetrahydrobenzo[d]thiazole-7- carboxamide Example 58 N-(2,4-dichloro-6-methylbenzyl)-2- F 3 0.96 423.0 (trifluoromethyl)-4,5,6,7- tetrahydrobenzo[d]thiazole-7- carboxamide Example 59 2-amino-N-(2,4-dichloro-6- L 3 0.62 369.8 methylbenzyl)-4,5,6,7- tetrahydrobenzo[d]thiazole-7- carboxamide Example 60 N-(2,4-dichloro-6-methylbenzyl)-2- M 3 0.71 368.9 methyl-4,5,6,7- tetrahydrobenzo[d]thiazole-7- carboxamide Example 61 2-bromo-N-(2,4-dichloro-6- F 3 0.91 432.9 methyl benzyl)-4,5,6,7- tetrahydrobenzo[d]thiazole-7- carboxamide Example 62 N-(2,4-dichloro-6-methylbenzyl)- F 3 0.75 355.2 4,5,6,7-tetrahydrobenzo[d]thiazole-7- carboxamide Example 63 N-(2,4-dichlorophenethyl)-4,5,6,7- D 2 1.12 355.0 tetrahydrobenzo[d]thiazole-7- carboxamide Example 64 N-((S)-1-(2,4-dichlorophenyl)-2- F, K, N 3 0.59 370.8 hydroxyethyl)-4,5,6,7- tetrahydrobenzo[d]thiazole-7- carboxamide (mixture of epimers) Example 65 N-(2,4-dichloro-6- C 2 0.92 371.0 (hydroxymethyl)benzyl)-4,5,6,7- tetrahydrobenzo[d]thiazole-7- carboxamide Example 66 2-bromo-N-(2-chloro-3- F 3 0.86 452.9 (trifluoromethyl)benzyl)-4,5,6,7- tetrahydrobenzo[d]thiazole-7- carboxamide Example 67 N-(2-chloro-3-(trifluoromethyl)benzyl)- D 2 1.10 374.8 4,5,6,7-tetrahydrobenzo[d]thiazole-7- carboxamide Example 68 N-(2,4-dichloro-6- D 2 1.13 385.0 (methoxymethyl)benzyl)-4,5,6,7- tetrahydrobenzo[d]thiazole-7- carboxamide Example 69 N-(3-fluoro-4- D 2 1.11 374.8 (trifluoromethoxy)benzyl)-4,5,6,7- tetrahydrobenzo[d]thiazole-7- carboxamide Example 70 N-(4-phenoxybenzyl)-4,5,6,7- D 2 1.15 365.1 tetrahydrobenzo[d]thiazole-7- carboxamide Example 71 2-amino-N-(2,4-dichlorobenzyl)- H 3 0.62 369.8 5,6,7,8-tetrahydro-4H- cyclohepta[d]thiazole-8-carboxamide Example 72 N-(2,4-dichlorobenzyl)-5,6,7,8- F 3 0.71 354.9 tetrahydro-4H-cyclohepta[d]thiazole- 8-carboxamide Example 73 2-amino-N-(2,4-dichloro-6- H 3 0.66 384.0 methylbenzyl)-5,6,7,8-tetrahydro-4H- cyclohepta[d]thiazole-8-carboxamide Example 74 N-(2,4-dichloro-6-methylbenzyl)- F 3 0.75 368.9 5,6,7,8-tetrahydro-4H- cyclohepta[d]thiazole-8-carboxamide Example 75 N-((S)-1-(2,4-dichlorophenyl)-2- F 3 0.61 384.9 hydroxyethyl)-5,6,7,8-tetrahydro-4H- cyclohepta[d]thiazole-8-carboxamide (epimer A) Example 76 N-((S)-1-(2,4-dichlorophenyl)-2- F 3 0.60 384.9 hydroxyethyl)-5,6,7,8-tetrahydro-4H- cyclohepta[d]thiazole-8-carboxamide (epimer B)

II. Biological Assays A. In Vitro Assay

The P2X₇ receptor antagonistic activity of the compounds of formula (I) is determined in accordance with the following experimental method.

B. Experimental Method Cell Line Generation and YO-PRO Assay

Cell line generation was performed in general according to established molecular cloning protocols. Specifically, RNA was extracted from human whole blood using the Qiagen RNeasy kit (Qiagen, CH) according to the manufacturer's instructions. Subsequently cDNA was made (Superscript II, Invitrogen AG, CH) and the human P2X7 gene (genbank ref. BC011913) was amplified with the following primers: ATCGCGGCCGCTCAGTAAGGACTCTTGAAGCCACT and CGCCGCTAGCACCACCATGCCGGCCTGCTGCAGCTGCA. The amplified sequence was subsequently ligated into a pcDNA3.1 (+) NotI, NheI digested plasmid. Human embryonic kidney (HEK) cells (ATCC CRL-1573, Manassas, Va., USA) were transfected with the pcDNA3.1 (+).hP2X7 plasmid using lipofectamine 2000 (Invitrogen AG, CH) according to the manufacturer's instructions. Following a 24 h exposure to DNA, cells were trypsinized and re-seeded at low density in the presence of 250 μg Geneticin. Geneticin resistant cells were then selected during two consecutive rounds of cloning by serial limiting dilution with visual inspection. Individual clones were screened for P2X7 expression by applying ATP and recording the resultant uptake of YO-PRO1. Specific cell clones were chosen based on RNA and protein expression. HEK cells stably expressing P2X7 were used to screen drugs using the YO-PRO1 assay. Cells were grown to confluency in adherent culture at 37° C. in a humidified 5% CO₂ incubator (split 1/5 every 3-4 days with DMEM, 10% FCS, 1% Penicillin/Streptomycin, 250 μg/ml Geneticin). Adherent cells were detached by incubation with Trypsine (1 ml per 165 cm² dish) for 2 minutes, then washed off with 10 ml PBS (without Mg²⁺ and Ca²⁺), and resuspended in DMEM, 10% FCS, 1% Penicillin/Streptomycin, no Geneticin. 10,000 cells per well (48 hours before the assay) or 25,000 cells per well (Vi-cell XR (Beckman Coulter) (24 hours before the assay) in 50 μl full medium were seeded on 384-well black-wall, clear bottom plates, that were coated before with 10 μl per well Poly-L-Lysine, incubated for 30-60 minutes at 37° C. and washed once with PBS. Medium was removed from cells and 50 μl of assay buffer containing 0.5 μM YO-PRO-1 was added into the wells. Solutions of antagonist compounds were prepared by serial dilutions of a 10 mM DMSO solution of the antagonist into PBS using a BioMek (Beckman Coulter). Each concentration was performed in duplicate. For IC₅₀ measurements 10 concentration points were measured (10 μM being the highest concentration followed by 9 serial dilution steps 1/3). The cells were incubated with the antagonists of the present invention together with ATP at a final concentration of 250 μM for 90 minutes. During this time period, four time points were taken. Each time point comprised the average of several measurements made within a few seconds. Fluorescence was measured in the FLIPR tetra (Molecular Devices) using the filters appropriate for YO-PRO-1 fluorescence (excitation 485/20, emission 530/25). The FLIPR tetra was equipped with Molecular Devices Screen Works system control software to define and run experimental protocols. For antagonist activity measurements, the maximal intensity was expressed as a percentage of that induced by the EC₅₀ value for agonist activation (0.25 mM ATP for HEK-293 cells expressing human recombinant P2X7 receptor). For IC50 measurements the maximum intensity is plotted against the concentration of compound to determine IC50 values.

Antagonistic activities with respect to the P2X₇ receptor (IC₅₀ values) of exemplified compounds are displayed in Table 1.

TABLE 1 Compound Name IC₅₀ [nM] Example 1 N-(4-chlorobenzyl)-5,6-dihydrofuro[2,3-d]thiazole-6- 4630 carboxamide Example 2 N-(2,4-dichlorobenzyl)-5,6-dihydrofuro[2,3-d]thiazole-6- 103 carboxamide Example 3 N-(2-chloro-4-fluorobenzyl)-5,6-dihydrofuro[2,3-d]thiazole-6- 183 carboxamide Example 4 N-(3,4-dichlorobenzyl)-5,6-dihydrofuro[2,3-d]thiazole-6- 2945 carboxamide Example 5 N-(2-bromo-4,6-dichlorobenzyl)-5,6-dihydrofuro[2,3- 7.3 d]thiazole-6-carboxamide Example 6 N-(2,4-dichloro-6-methylbenzyl)-5,6-dihydrofuro[2,3- 4.3 d]thiazole-6-carboxamide Example 7 N-(2,4-dichlorophenethyl)-5,6-dihydrofuro[2,3-d]thiazole-6- 428 carboxamide Example 8 N-(3-(2,4-dichlorophenyl)propyl)-5,6-dihydrofuro[2,3- 359 d]thiazole-6-carboxamide Example 9 N-((S)-1-(2,4-dichlorophenyl)-2-hydroxyethyl)-5,6- 316 dihydrofuro[2,3-d]thiazole-6-carboxamide (mixture of epimers) Example 10 N-(2,4-dichloro-6-(hydroxymethyl)benzyl)-5,6-dihydrofuro[2,3- 12 d]thiazole-6-carboxamide Example 11 N-(5,7-dichloro-2,3-dihydro-1H-inden-1-yl)-5,6- 4.1 dihydrofuro[2,3-d]thiazole-6-carboxamide (mixture of epimers) Example 12 N-(2,4-dichloro-6-cyclopropylbenzyl)-5,6-dihydrofuro[2,3- 13 d]thiazole-6-carboxamide Example 13 N-(2-chloro-3-(trifluoromethyl) benzyl)-5,6-dihydrofuro[2,3- 17 d]thiazole-6-carboxamide Example 14 N-(3-chloro-2-(trifluoromethyl) benzyl)-5,6-dihydrofuro[2,3- 38 d]thiazole-6-carboxamide Example 15 N-(2,4-dichloro-6-((2-hydroxyethoxy)methyl)benzyl)-5,6- 15 dihydrofuro[2,3-d]thiazole-6-carboxamide Example 16 N-(4-phenoxybenzyl)-5,6-dihydrofuro[2,3-d]thiazole-6- 1572 carboxamide Example 17 N-(2,4-dichlorobenzyl)-5,6-dihydro-4H-cyclopenta[d]thiazole- 11 6-carboxamide Example 18 N-(2-chloro-4-fluorobenzyl)-5,6-dihydro-4H- 66 cyclopenta[d]thiazole-6-carboxamide Example 19 N-(2-bromo-4,6-dichlorobenzyl)-5,6-dihydro-4H- 4.5 cyclopenta[d]thiazole-6-carboxamide Example 20 N-(2,4-dichloro-6-methylbenzyl)-5,6-dihydro-4H- 1.5 cyclopenta[d]thiazole-6-carboxamide Example 21 N-(2,4-dichlorophenethyl)-5,6-dihydro-4H- 122 cyclopenta[d]thiazole-6-carboxamide Example 22 N-(2-chloro-3-cyanobenzyl)-5,6-dihydro-4H- 85 cyclopenta[d]thiazole-6-carboxamide Example 23 N-(3-(2,4-dichlorophenyl)propyl)-5,6-dihydro-4H- 158 cyclopenta[d]thiazole-6-carboxamide Example 24 N-((S)-1-(2,4-dichlorophenyl)-2-hydroxyethyl)-5,6-dihydro-4H- 92 cyclopenta[d]thiazole-6-carboxamide (mixture of epimers) Example 25 N-(2,4-dichloro-6-(hydroxymethyl)benzyl)-5,6-dihydro-4H- 6.3 cyclopenta[d]thiazole-6-carboxamide Example 26 N-(2,4-dichloro-6-methoxybenzyl)-5,6-dihydro-4H- 49 cyclopenta[d]thiazole-6-carboxamide Example 27 N-(5,7-dichloro-2,3-dihydro-1H-inden-1-yl)-5,6-dihydro-4H- 3.0 cyclopenta[d]thiazole-6-carboxamide (mixture of epimers) Example 28 N-(2-chloro-3-(trifluoromethyl)benzyl)-5,6-dihydro-4H- 4.7 cyclopenta[d]thiazole-6-carboxamide Example 29 N-(3-fluoro-4-(trifluoromethoxy)benzyl)-5,6-dihydro-4H- 2000 cyclopenta[d]thiazole-6-carboxamide Example 30 N-(4-chlorobenzyl)-N-methyl-6,7-dihydro-5H-pyrano[2,3- 6105 d]thiazole-7-carboxamide Example 31 N-(2,4-dichlorobenzyl)-6,7-dihydro-5H-pyrano[2,3-d]thiazole- 22 7-carboxamide Example 32 N-(2-chloro-4-fluorobenzyl)-6,7-dihydro-5H-pyrano[2,3- 76 d]thiazole-7-carboxamide Example 33 N-(2,3-dichlorobenzyl)-6,7-dihydro-5H-pyrano[2,3-d]thiazole- 44 7-carboxamide Example 34 N-(2,4-dichloro-6-methylbenzyl)-6,7-dihydro-5H-pyrano[2,3- 1.6 d]thiazole-7-carboxamide Example 35 N-(2,4-dichlorophenethyl)-6,7-dihydro-5H-pyrano[2,3- 111 d]thiazole-7-carboxamide Example 36 N-(2-chloro-3-cyanobenzyl)-6,7-dihydro-5H-pyrano[2,3- 71 d]thiazole-7-carboxamide Example 37 N-(4-(trifluoromethyl)benzyl)-6,7-dihydro-5H-pyrano[2,3- 1605 d]thiazole-7-carboxamide Example 38 N-(3-(2,4-dichlorophenyl)propyl)-6,7-dihydro-5H-pyrano[2,3- 500 d]thiazole-7-carboxamide Example 39 N-((S)-1-(2,4-dichlorophenyl)-2-hydroxyethyl)-6,7-dihydro-5H- 139 pyrano[2,3-d]thiazole-7-carboxamide (mixture of epimers) Example 40 N-(2,4-dichloro-6-(hydroxymethyl)benzyl)-6,7-dihydro-5H- 5.2 pyrano[2,3-d]thiazole-7-carboxamide Example 41 N-(5,7-dichloro-2,3-dihydro-1H-inden-1-yl)-6,7-dihydro-5H- 1.8 pyrano[2,3-d]thiazole-7-carboxamide (mixture of epimers) Example 42 N-(2-chloro-3-(trifluoromethyl)benzyl)-6,7-dihydro-5H- 6.9 pyrano[2,3-d]thiazole-7-carboxamide Example 43 N-(2,4-dichloro-6-(2-hydroxyethoxy)benzyl)-6,7-dihydro-5H- 53 pyrano[2,3-d]thiazole-7-carboxamide Example 44 N-(3-fluoro-4-(trifluoromethoxy)benzyl)-6,7-dihydro-5H- 3795 pyrano[2,3-d]thiazole-7-carboxamide Example 45 N-(4-phenoxybenzyl)-6,7-dihydro-5H-pyrano[2,3-d]thiazole-7- 733 carboxamide Example 46 N-(4-chlorobenzyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7- 269 carboxamide Example 47 N-(4-chlorobenzyl)-N-methyl-4,5,6,7- 736 tetrahydrobenzo[d]thiazole-7-carboxamide Example 48 N-(3-chloro-2-methylbenzyl)-4,5,6,7- 7.5 tetrahydrobenzo[d]thiazole-7-carboxamide Example 49 2-amino-N-(2,4-dichlorobenzyl)-4,5,6,7- 25 tetrahydrobenzo[d]thiazole-7-carboxamide Example 50 N-(2,4-dichlorobenzyl)-2-methyl-4,5,6,7- 20 tetrahydrobenzo[d]thiazole-7-carboxamide Example 51 2-bromo-N-(2,4-dichlorobenzyl)-4,5,6,7- 23 tetrahydrobenzo[d]thiazole-7-carboxamide Example 52 N-(2,4-dichlorobenzyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7- 7.5 carboxamide Example 53 N-(2-chloro-4-fluorobenzyl)-4,5,6,7- 13 tetrahydrobenzo[d]thiazole-7-carboxamide Example 54 N-(2,3-dichlorobenzyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7- 8.9 carboxamide Example 55 N-(2,3-dihydro-1H-inden-1-yl)-4,5,6,7- 143 tetrahydrobenzo[d]thiazole-7-carboxamide (mixture of 4 stereoisomers) Example 56 N-((R)-1-(2,4-dichlorophenyl)ethyl)-4,5,6,7- 6.7 tetrahydrobenzo[d]thiazole-7-carboxamide (mixture of epimers) Example 57 N-(2,4-dichloro-6-methylbenzyl)-2-phenyl-4,5,6,7- 1040 tetrahydrobenzo[d]thiazole-7-carboxamide Example 58 N-(2,4-dichloro-6-methylbenzyl)-2-(trifluoromethyl)-4,5,6,7- 31 tetrahydrobenzo[d]thiazole-7-carboxamide Example 59 2-amino-N-(2,4-dichloro-6-methylbenzyl)-4,5,6,7- 4.9 tetrahydrobenzo[d]thiazole-7-carboxamide Example 60 N-(2,4-dichloro-6-methylbenzyl)-2-methyl-4,5,6,7- 4.3 tetrahydrobenzo[d]thiazole-7-carboxamide Example 61 2-bromo-N-(2,4-dichloro-6-methylbenzyl)-4,5,6,7- 12 tetrahydrobenzo[d]thiazole-7-carboxamide Example 62 N-(2,4-dichloro-6-methylbenzyl)-4,5,6,7- 1.9 tetrahydrobenzo[d]thiazole-7-carboxamide Example 63 N-(2,4-dichlorophenethyl)-4,5,6,7-tetrahydrobenzo[d]thiazole- 20 7-carboxamide Example 64 N-((S)-1-(2,4-dichlorophenyl)-2-hydroxyethyl)-4,5,6,7- 96 tetrahydrobenzo[d]thiazole-7-carboxamide (mixture of epimers) Example 65 N-(2,4-dichloro-6-(hydroxymethyl)benzyl)-4,5,6,7- 2.7 tetrahydrobenzo[d]thiazole-7-carboxamide Example 66 2-bromo-N-(2-chloro-3-(trifluoromethyl)benzyl)-4,5,6,7- 13 tetrahydrobenzo[d]thiazole-7-carboxamide Example 67 N-(2-chloro-3-(trifluoromethyl) benzyl)-4,5,6,7- 2.6 tetrahydrobenzo[d]thiazole-7-carboxamide Example 68 N-(2,4-dichloro-6-(methoxymethyl)benzyl)-4,5,6,7- 4.3 tetrahydrobenzo[d]thiazole-7-carboxamide Example 69 N-(3-fluoro-4-(trifluoromethoxy)benzyl)-4,5,6,7- 457 tetrahydrobenzo[d]thiazole-7-carboxamide Example 70 N-(4-phenoxybenzyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7- 168 carboxamide Example 71 2-amino-N-(2,4-dichlorobenzyl)-5,6,7,8-tetrahydro-4H- 94 cyclohepta[d]thiazole-8-carboxamide Example 72 N-(2,4-dichlorobenzyl)-5,6,7,8-tetrahydro-4H- 36 cyclohepta[d]thiazole-8-carboxamide Example 73 2-amino-N-(2,4-dichloro-6-methylbenzyl)-5,6,7,8-tetrahydro- 13 4H-cyclohepta[d]thiazole-8-carboxamide Example 74 N-(2,4-dichloro-6-methylbenzyl)-5,6,7,8-tetrahydro-4H- 3.9 cyclohepta[d]thiazole-8-carboxamide Example 75 N-((S)-1-(2,4-dichlorophenyl)-2-hydroxyethyl)-5,6,7,8- 82 tetrahydro-4H-cyclohepta[d]thiazole-8-carboxamide (epimer A) Example 76 N-((S)-1-(2,4-dichlorophenyl)-2-hydroxyethyl)-5,6,7,8- 114 tetrahydro-4H-cyclohepta[d]thiazole-8-carboxamide (epimer B) 

1. A compound of the formula (I),

wherein n represents 1, 2 or 3; m represents 0, 1 or 2; p represents 0, 1 or 2; X represents —O— or —CH₂—; R¹ represents hydrogen, (C₁-C₂)alkyl or hydroxy-(C₁-C₂)alkyl and R² represents hydrogen or halogen; or R¹ and R² together represent a —CH₂CH₂— or a —CH₂CH₂CH₂— group; each R³ independently represents (C₁-C₄)alkyl, (C₃-C₆)cycloalkyl, (C₁-C₄)alkoxy, hydroxy-(C₁-C₃)alkyl, hydroxy-(C₂-C₃)alkoxy, hydroxy-(C₂-C₃)alkoxy-(C₁-C₂)alkyl, (C₁-C₂)alkoxy-(C₁-C₂)alkyl, (C₁-C₃)fluoroalkyl, (C₁-C₃)fluoroalkoxy, cyano, halogen or phenoxy; R⁴ represents hydrogen, (C₁-C₄)alkyl, (C₁-C₃)fluoroalkyl, amino, halogen or phenyl; and R⁵ represents hydrogen or methyl; or a salt of such a compound.
 2. The compound of formula (I) according to claim 1, that is a compound of formula (I_(XO)),

wherein n represents 1, 2 or 3; m represents 0, 1 or 2; p represents 1 or 2; R¹ represents hydrogen, (C₁-C₂)alkyl or hydroxy-(C₁-C₂)alkyl and R² represents hydrogen or halogen; or R¹ and R² together represent a —CH₂CH₂— or a —CH₂CH₂CH₂— group; each R³ independently represents (C₁-C₄)alkyl, (C₃-C₆)cycloalkyl, (C₁-C₄)alkoxy, hydroxy-(C₁-C₃)alkyl, hydroxy-(C₂-C₃)alkoxy, hydroxy-(C₂-C₃)alkoxy-(C₁-C₂)alkyl, (C₁-C₂)alkoxy-(C₁-C₂)alkyl, (C₁-C₃)fluoroalkyl, (C₁-C₃)fluoroalkoxy, cyano, halogen or phenoxy; and R⁵ represents hydrogen or methyl; or a salt of such a compound.
 3. The compound of formula (I) according to claim 1, wherein m represents 0; or a salt of such a compound.
 4. The compound of formula (I) according to claim 1, wherein p represents 2; or a salt of such a compound.
 5. The compound of formula (I) according to claim 1, wherein R¹ represents hydrogen and R² represents chloro; or a salt of such a compound.
 6. The compound of formula (I) according to claim 1, wherein R¹ and R² together represent a —CH₂CH₂— group; or a salt of such a compound.
 7. The compound of formula (I) according to claim 1, wherein a first R³ group is attached in para-position relative to the R¹-bearing carbon atom and represents chloro; and a second R³ group is absent, or is attached in ortho-position relative to the R¹-bearing carbon atom and represents methyl, cyclopropyl, methoxy, hydroxy-methyl, 2-hydroxy-ethoxy, (2-hydroxy-ethoxy)-methyl, methoxy-methyl, chloro or bromo; or a salt of such a compound.
 8. The compound of formula (I) according to claim 1, wherein R⁴ represents hydrogen; or a salt of such a compound.
 9. The compound of formula (I) according to claim 1, wherein R⁵ represents hydrogen; or a salt of such a compound.
 10. The compound of formula (I) according to claim 1, selected from the group consisting of: N-(4-chlorobenzyl)-5,6-dihydrofuro[2,3-d]thiazole-6-carboxamide; N-(2,4-dichlorobenzyl)-5,6-dihydrofuro[2,3-d]thiazole-6-carboxamide; N-(2-chloro-4-fluorobenzyl)-5,6-dihydrofuro[2,3-d]thiazole-6-carboxamide; N-(3,4-dichlorobenzyl)-5,6-dihydrofuro[2,3-d]thiazole-6-carboxamide; N-(2-bromo-4,6-dichlorobenzyl)-5,6-dihydrofuro[2,3-d]thiazole-6-carboxamide; N-(2,4-dichloro-6-methylbenzyl)-5,6-dihydrofuro[2,3-d]thiazole-6-carboxamide; N-(2,4-dichlorophenethyl)-5,6-dihydrofuro[2,3-d]thiazole-6-carboxamide; N-(3-(2,4-dichlorophenyl)propyl)-5,6-dihydrofuro[2,3-d]thiazole-6-carboxamide; N-(1-(2,4-dichlorophenyl)-2-hydroxyethyl)-5,6-dihydrofuro[2,3-d]thiazole-6-carboxamide; N-(2,4-dichloro-6-(hydroxymethyl)benzyl)-5,6-dihydrofuro[2,3-d]thiazole-6-carboxamide; N-(5,7-dichloro-2,3-dihydro-1H-inden-1-yl)-5,6-dihydrofuro[2,3-d]thiazole-6-carboxamide; N-(2,4-dichloro-6-cyclopropylbenzyl)-5,6-dihydrofuro[2,3-d]thiazole-6-carboxamide; N-(2-chloro-3-(trifluoromethyl)benzyl)-5,6-dihydrofuro[2,3-d]thiazole-6-carboxamide; N-(3-chloro-2-(trifluoromethyl)benzyl)-5,6-dihydrofuro[2,3-d]thiazole-6-carboxamide; N-(2,4-dichloro-6-((2-hydroxyethoxy)methyl)benzyl)-5,6-dihydrofuro[2,3-d]thiazole-6-carboxamide; N-(4-phenoxybenzyl)-5,6-dihydrofuro[2,3-d]thiazole-6-carboxamide; N-(2,4-dichlorobenzyl)-5,6-dihydro-4H-cyclopenta[d]thiazole-6-carboxamide; N-(2-chloro-4-fluorobenzyl)-5,6-dihydro-4H-cyclopenta[d]thiazole-6-carboxamide; N-(2-bromo-4,6-dichlorobenzyl)-5,6-dihydro-4H-cyclopenta[d]thiazole-6-carboxamide; N-(2,4-dichloro-6-methylbenzyl)-5,6-dihydro-4H-cyclopenta[d]thiazole-6-carboxamide; N-(2,4-dichlorophenethyl)-5,6-dihydro-4H-cyclopenta[d]thiazole-6-carboxamide; N-(2-chloro-3-cyanobenzyl)-5,6-dihydro-4H-cyclopenta[d]thiazole-6-carboxamide; N-(3-(2,4-dichlorophenyl)propyl)-5,6-dihydro-4H-cyclopenta[d]thiazole-6-carboxamide; N-(1-(2,4-dichlorophenyl)-2-hydroxyethyl)-5,6-dihydro-4H-cyclopenta[d]thiazole-6-carboxamide; N-(2,4-dichloro-6-(hydroxymethyl)benzyl)-5,6-dihydro-4H-cyclopenta[d]thiazole-6-carboxamide; N-(2,4-dichloro-6-methoxybenzyl)-5,6-dihydro-4H-cyclopenta[d]thiazole-6-carboxamide; N-(5,7-dichloro-2,3-dihydro-1H-inden-1-yl)-5,6-dihydro-4H-cyclopenta[d]thiazole-6-carboxamide; N-(2-chloro-3-(trifluoromethyl)benzyl)-5,6-dihydro-4H-cyclopenta[d]thiazole-6-carboxamide; N-(3-fluoro-4-(trifluoromethoxy)benzyl)-5,6-dihydro-4H-cyclopenta[d]thiazole-6-carboxamide; N-(4-chlorobenzyl)-N-methyl-6,7-dihydro-5H-pyrano[2,3-d]thiazole-7-carboxamide; N-(2,4-dichlorobenzyl)-6,7-dihydro-5H-pyrano[2,3-d]thiazole-7-carboxamide; N-(2-chloro-4-fluorobenzyl)-6,7-dihydro-5H-pyrano[2,3-d]thiazole-7-carboxamide; N-(2,3-dichlorobenzyl)-6,7-dihydro-5H-pyrano[2,3-d]thiazole-7-carboxamide; N-(2,4-dichloro-6-methylbenzyl)-6,7-dihydro-5H-pyrano[2,3-d]thiazole-7-carboxamide; N-(2,4-dichlorophenethyl)-6,7-dihydro-5H-pyrano[2,3-d]thiazole-7-carboxamide; N-(2-chloro-3-cyanobenzyl)-6,7-dihydro-5H-pyrano[2,3-d]thiazole-7-carboxamide; N-(4-(trifluoromethyl)benzyl)-6,7-dihydro-5H-pyrano[2,3-d]thiazole-7-carboxamide; N-(3-(2,4-dichlorophenyl)propyl)-6,7-dihydro-5H-pyrano[2,3-d]thiazole-7-carboxamide; N—((S)-1-(2,4-dichlorophenyl)-2-hydroxyethyl)-6,7-dihydro-5H-pyrano[2,3-d]thiazole-7-carboxamide; N-(2,4-dichloro-6-(hydroxymethyl)benzyl)-6,7-dihydro-5H-pyrano[2,3-d]thiazole-7-carboxamide; N—((S)-5,7-dichloro-2,3-dihydro-1H-inden-1-yl)-6,7-dihydro-5H-pyrano[2,3-d]thiazole-7-carboxamide; N-(2-chloro-3-(trifluoromethyl)benzyl)-6,7-dihydro-5H-pyrano[2,3-d]thiazole-7-carboxamide; N-(2,4-dichloro-6-(2-hydroxyethoxy)benzyl)-6,7-dihydro-5H-pyrano[2,3-d]thiazole-7-carboxamide; N-(3-fluoro-4-(trifluoromethoxy)benzyl)-6,7-dihydro-5H-pyrano[2,3-d]thiazole-7-carboxamide; N-(4-phenoxybenzyl)-6,7-dihydro-5H-pyrano[2,3-d]thiazole-7-carboxamide; N-(4-chlorobenzyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; N-(4-chlorobenzyl)-N-methyl-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; N-(3-chloro-2-methylbenzyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; 2-amino-N-(2,4-dichlorobenzyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; N-(2,4-dichlorobenzyl)-2-methyl-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; 2-bromo-N-(2,4-dichlorobenzyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; N-(2,4-dichlorobenzyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; N-(2-chloro-4-fluorobenzyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; N-(2,3-dichlorobenzyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; N-(2,3-dihydro-1H-inden-1-yl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; N—((R)-1-(2,4-dichlorophenyl)ethyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; N-(2,4-dichloro-6-methylbenzyl)-2-phenyl-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; N-(2,4-dichloro-6-methylbenzyl)-2-(trifluoromethyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; 2-amino-N-(2,4-dichloro-6-methylbenzyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; N-(2,4-dichloro-6-methylbenzyl)-2-methyl-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; 2-bromo-N-(2,4-dichloro-6-methylbenzyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; N-(2,4-dichloro-6-methylbenzyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; N-(2,4-dichlorophenethyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; N—((S)-1-(2,4-dichlorophenyl)-2-hydroxyethyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; N-(2,4-dichloro-6-(hydroxymethyl)benzyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; 2-bromo-N-(2-chloro-3-(trifluoromethyl)benzyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; N-(2-chloro-3-(trifluoromethyl)benzyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; N-(2,4-dichloro-6-(methoxymethyl)benzyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; N-(3-fluoro-4-(trifluoromethoxy)benzyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; N-(4-phenoxybenzyl)-4,5,6,7-tetrahydrobenzo[d]thiazole-7-carboxamide; 2-amino-N-(2,4-dichlorobenzyl)-5,6,7,8-tetrahydro-4H-cyclohepta[d]thiazole-8-carboxamide; N-(2,4-dichlorobenzyl)-5,6,7,8-tetrahydro-4H-cyclohepta[d]thiazole-8-carboxamide; 2-amino-N-(2,4-dichloro-6-methylbenzyl)-5,6,7,8-tetrahydro-4H-cyclohepta[d]thiazole-8-carboxamide; N-(2,4-dichloro-6-methylbenzyl)-5,6,7,8-tetrahydro-4H-cyclohepta[d]thiazole-8-carboxamide; (R)—N—((S)-1-(2,4-dichlorophenyl)-2-hydroxyethyl)-5,6,7,8-tetrahydro-4H-cyclohepta[d]thiazole-8-carboxamide; and (S)—N—((S)-1-(2,4-dichlorophenyl)-2-hydroxyethyl)-5,6,7,8-tetrahydro-4H-cyclohepta[d]thiazole-8-carboxamide; or a salt of such a compound.
 11. A pharmaceutical composition containing, as active principle the compound of formula (I) according to claim 1, or a pharmaceutically acceptable salt thereof, and at least one therapeutically inert excipient.
 12. A pharmaceutical composition containing, as active principle, a compound of formula (I) according to claim 10, or a pharmaceutically acceptable salt thereof, and at least one therapeutically inert excipient.
 13. A method for the prevention or treatment of a disease selected from pain; neurodegenerative and neuroinflammatory diseases; bone and joint diseases; obstructive diseases of the airways; cardiovascular diseases; eye diseases; skin diseases; abdominal and gastrointestinal tract diseases; genitourinary diseases; cancer; other auto-immune and allergic disorders; and other disorders with an inflammatory or immunological component, comprising administering to a subject a pharmaceutically active amount of a compound according to claim 1, or a pharmaceutically acceptable salt thereof.
 14. A method for the prevention or treatment of a disease selected from pain; neurodegenerative and neuroinflammatory diseases; bone and joint diseases; obstructive diseases of the airways; cardiovascular diseases; eye diseases; skin diseases; abdominal and gastrointestinal tract diseases; genitourinary diseases; cancer; other auto-immune and allergic disorders; and other disorders with an inflammatory or immunological component, comprising administering to a subject a pharmaceutically active amount of a compound according to claim 10, or a pharmaceutically acceptable salt thereof. 